Gas oven that cooks unevenly

try this link... what setting to use for cookies and how long should they bake Google Search

Read your user manual about settings and rack placement.
Also check to see if you upper oven coil is working.
Ask your appliance maker or appliance repair shop.
Did you get a warranty for your oven?

That oven is very poorly rated and is prone to a lot of repairs. Most people advise to get something else. There is no common solution. I am sorry.

Hi.... you have a bad oven "temperature sensor"

have you tried a different cake pan,if cookies are coming out good and it's cooking your meat on time then it doesn't sound like it's the stove

Inside your oven you have an array of louvers or fins in the back left corner and the front right corner. Sometimes a tray will jam and knock one of the louvers out of adjustment. You may need to call a local authorized service provider to come and reset your louvers to the factory settings. In the meantime you can attempt to make small adjustments to see if you can rectify the issue.

Do not ever adjust the louvers in the back left corner of the oven.
For the trays in question, to direct more air towards the center of the cookie sheet slightly bend the louvers in the front right backwards towards the rear of the oven. ONLY MAKE SLIGHT ADJUSTMENTS!! If you bend the louvers too far you will end up burning the center of the cookie sheet and under cooking the edges.

i would say you have a bad board

I repair commercial cooking equipment for a living. When a customer complains about uneven cooking the #1 thing that these manufacturers ask is..... are they turning (180*) the baking sheets half way thru the cook cycle. #2 are they staggering the pans front to back & side to side. It's kind of a pain but, works for the commercial ones.