Toilet is unstable with respect to the floor. it rocks when you get on and off it.

check around where the tank meets the bowl and see if water appears when you flush and if so you need a new tank gasket. If it's coming from where the toilet meets the floor you will have to change the wax seal underneath. That happens when the toilet rocks and ruins the wax gasket.

Then the wax seal was put on wrong. If the toilet rocks it will ruin the seal. once the wax is squeezed it can't be moved. Sometimes the wrong thickness of wax was chosen. If a new floor was put down the flange may have required a booster kit before putting the seal on

I haven't sat on your toilet, so the rockin' don't come from me! Our grandpa had a habit of slamming his a@@ down on the toilet here at my house, so now it rocks when sat on. The bolts have shifted, or the wax ring was smisshed. If you take off the toilet from the floor, and find out either/or, let me know.

This is not an easy one as it could be a lot of different thing causing this problem. The easiest one first, check to see if the bolts holding the toilet to the closet collar are tight they may be under the two half round covers on either side of the toilet bowl. If they are not tight you can try tightening them be real careful not to break the bowl flanges. If that doesn't fix the problem you will need to take up the toilet and see if the toilet flange is in good shape and that the floor has not rotted out or that the bolts have not pulled loose from the closet flange.

As you can see this could get into a lot of work.

Good Luck.

This sounds like poor installation.
If you can get the person who installed it to come back to your home & make it right, you certainly should.

There is typically a wax gasket that connects the toilet to the drain pipe at floor level. This gasket needs, first of all, to fit. Then it needs to be well-seated (it's wax, and compressible) by rocking the toilet back & forth before the toilet is securely clamped down.

If it's not a problem of poor installation, it may be that your floor is uneven, or that there are tiles (under the toilet) that are chipped or missing - in other words, physical conditions that are interfering with the secure installation and tightening down of your toilet.

I wish you luck!

Qualified? Plumber? sounds like it needs to be shimed,because not all floors are exactly level,or castings of toilets exactly perfect.Doesn't sound like the handyman knows what he's doing.Shims available at home depot--plastic-don't shim with wood-it will rot.I've used various coins to get right thickness.Be careful tightening bolts,you'll crack bowl.Find a legit plumber licensed

you are correct if you overtighten the bolts the tank will crack.
They make rubber spacers that go between the tank and the stool, that can be put in to help the part of rocking or wiggly, try that.

with your toliet making a crunching noise on the tile, my first question is does the toliet rock at all? i would try and tighten the bolts on the base or the next step would be to pull the toliet and put a new wax ring then tighten it down. It makes a crunching sound because part of it is hitting the tile so makes sure it tight to the floor

No, you don't have to, but it makes for a nicer job. The wax ring must provide the complete seal to the sewer and must not leak at all. The use of caulking under the outer edge provides for a neat seal so that water or waste that gets on the floor does not collect under the edge of the toilet where it meets the floor. The caulking can also provide a bit of stability if the floor is uneven and the flange is a bit high, in which case the toilet might rock a little - which could compromise the seal of the wax ring. If a plumber installs a toilet, they will put the caulking down right away because they are confident in their installation of the wax ring and they need to move on. If the floor is a soft material (anything except stone or ceramic tile), then the home meowner might want to wait a couple of days before applying caulking to be certain that they don't conceal a leaking wax ring. If your toiled does rock a little, give the caulking a day to dry before using it again. On the other hand, if you do have a hard surface floor, it's a good idea to apply the caulk to the bottom of the toilet before you put the bowl down to give a bit of cushion where the porcelain bowl meets the hard floor.

I believe that I qualify... over 300 toilets installed in the past 15 months!!

I would go with the wax rings... but I would press the ring into the base of the toilet before installing the toilet....that way you are sure to have a good seal to the toilet....

If you actually read the directions, the manufacturer will tell you to press the wax ring onto the toilet....then install it onto the floor drain.
I guess that a PLAIN wax ring placed on the floor drain (since it is recessed) before placing the rubber-sleeve equipped ringed toiled is a good safety measure... I have done that an it work about 37 times out of 40.

Good question - BTW.. and well worded. THANKS for being specific and precise!!

Go to a hardware outlet(Lowe's, HomeDepot, etc.) and ask for a commode drain extension that can be placed over the existing and bring it up to the level of your floor. I also like the wax rings with the cup molded in. These can be doubled up also but not as reliable as the extension.
Eric