Turntable's Auto Arm function is messing up?

I have a Denon DP 300F automatic turntable and starting yesterday, when I pressed 'Start' the arm would go to the middle of the record and start there. It was always the same point, even for different albums. I thought it might be the tracking force, so I bought a Shure SFG-2 and set the tracking force. Today I played a record (a different one) and the arm did the same thing, it moved to the same spot in the middle of the record (around the end of Track 3). I can still manually start albums, but the auto start/return function is pretty convenient, so I was wondering if there was a way to fix this? Thanks!
Sounds like it is set up for a 45 record size. Is there any kind of switch on that table for record size?
That table has selection for 30cm or 17cm record size.You have it on the smaller one.
It's actually set up to 33rpm. and the size is right too (30 not 17). really don't know what's wrong. I mean, I guess it isn't that big of a deal, but being able to start records with the auto arm would be nice.
Agree somewhere you accidentally set it for a 7" record. Just have to find the right setting in thhe buttons.