The bottom stitching looks like a line and not stitches the top stitching is fine

Your tension is too tight. Increase the tension to a higher number, then check the stitch with a scrap piece of material to see what the stitch looks like. Also your thread makes a difference.different treads on bottom and on top will make you stitches abnormal.

try adjusting the top thread tension just a little and then sew on a scrap piece of fabric till the bottom stitch look correct.

top tension must be adjusted to fix loose stitches of bottom stitches
adust the top tension one letter or number higher and sew on a scrap
piece of fabric till stitches look correct,, here is a free manual
http://www.singerco.com/uploads/download/36952a1312a6d8436174ef874f3662471a946b64.pdf

try adjusting the top thread tension and see if that helps
also try changing the thread.
also change the needle--make sure it's the right needle for the fabric
being sewed.

try changing the needle
rethread the machine use every thread guide
check to see if the thread has come off the thread take up lever
clean under the needle plate & in the bobbin area for lint
if none of these suggestions work, then the machine needs to be
checked to see if there is a problem with the timing

put your thread on there right place, and adjust your tension.and change your needle.

you have your thread tension too tight that's why it is pulling the bottom stitch all the way through it looks good from the bottom but not good on top. Its pulled the stitch all the way through the material.
I had my own upholstery shop 18 yrs and tension gets you every time.Just loosen the top tension.

If it was sewing correctly BEFORE the needle break...why did the needle break in the first place?...and what fixes did you make?
If it sewed properly...what changed?

Cut your upper thread close to the spool...make sure the presser foot is raised and pull the cut off thread section through/out of the machine from the needle area (sewing direction...do not pull the thread backwards!)

Clean out the bobbin area...remove any traces of lint or pieces of thread...look for any broken off needle pieces... brush the bobbin area out....then add a drop of sewing machine oil (but only if your manual says to oil that area).

Remove the needle plate to expose the feed dogs...brush/clean out that area too and add a drop of sewing machine oil...then secure the needle plate back on.
Replace the needle...do it again...yup...some needles arrive bad from the factory. Make sure the needle is inserted and positioned properly. Then thread the machine WITH the presser foot in raised position. (The thread needs to get seated into the upper tensions.)
..with the.presser foot down...thread the new needle.
Oh...and use the correct needle for the thread. (a universal 80/12 is standard).
Thread can cause issues too. Try a different bobbin, or maybe a different spool of thread to see if that makes a difference.

Sounds like a bottom tension problem, to be sure I would have to have a look, I would suggest you have it looked at. Not sure about the materials you are sewing and have serious doubts as to whether the machine you are using is up for the job and will give you a satisfactory finish. It is possible a "walking foot" machine is what you need.

I do not have a buttonhole foot, but I can tell you how I do it with the zig zag foot on the Singer 132Q machine.

1. Mark the spacing and size for the buttonholes with chalk or marking paper. This consists of a straight line with a perpendicular line at the top and bottom that lets you know how big to make the hole. There is probably a pattern piece to let you know what the spacing should be, and you can get the size of the hole for the top and bottom line by laying the button you are going to use on top of the line you draw with the pattern.

2. Make sure the bobbin has plenty of thread.

3. Put the zig zag foot on the machine.

4. Set the stitch size to 1 or maybe a little less. You want a tight stitch to hold the hole together.

5. Start at the top of the buttonhole with the perpendicular line barely visible in the zig zag foot. Think of it as placing the "T" made by the mark in the "T" made by the opening in the zig zag foot.

6. Set the needle pattern to #1 of the buttonhole pattern (2nd from the top). Make sure it is toward the top of the number to insure you get a wide zig zag stitch. If you are getting a narrow stitch, you may have to fiddle with it, but it will work. Stitch 4-6 times making sure the stitch is wide, and end on the left side of the stitch.

7. Change the needle pattern to #2 of the buttonhole pattern and zig zag stitch down to the bottom mark. Do not pull the fabric or you will stretch the stitch. Make sure your last stitch is on the left hand side.

8. Change the needle pattern to #3 of the buttonhole pattern (same as #1), and zig zag stitch 4-6 times ending on the right side this time. Make sure the stitches are wide.

9. Change the needle pattern to #4 of the buttonhole pattern and straight stitch back to the top mark. Be prepared to hand roll the needle the last few stitches to make sure you do not pass the top stitches you have made.

10. Change the needle pattern to #5 of the buttonhole pattern and zig zag stitch back to the bottom mark. Hand roll the last few stitches and end on the left side.

11. Raise the foot and remove the fabric. You are now ready proceed to the next buttonhole or cut the buttonhole open with a small pair of scissors or a seam ripper. Make sure you do not cut any of your stitches.



Make sure you practice on some scrap fabric of the same thickness (2 layers of fabric plus pellon) to make sure you have the size right before you sew the buttonholes on the garment.

GOOD LUCK.