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Someone mentioned pyramiding. Pyramiding is caused by long term over feeding. I use to feed my turtle too much when he was young and now you can see what it has done to his shell. I'll post a photo after. I would recommend giving your turtle more UVB. The stuff your turtle absorbs from the sun can not be absorbed through a window so if you don't have I would recommend getting a UVB lamp.Your turtle looks to be full grown so It might not make a difference. What do you feed your turtle?
Yeah UVB can't travel through glass, I've got a UVB lamp I leave on for 12 hours a day maybe don't need it quite that long but like to give the turtles options to get out as and when they want. Also the food can make a difference do you feed a lot of pellet food?
That's how I feed my guy. I mix up what I feed him. I only feed reptomin pellets, lettuce, and sometimes minnows. Your gonna say that's a pretty boring diet but sometimes simple is healthy. Remember when ever you feed your turtle only feed as much as can fit in there head. What I mean by this is pretend your turtle's head is hollow. Only feed enough so that you fill there head, no more than that. Make sense? I know it sounds like a weird rule but you have to do it. Turtles don't when there full and they will eat tell they throw up. Btw how big is your tank?