I've only been playing Binding of Isaac: Rebirth and Rainbow Six 3 recently, and now in Rebirth, my overlay is gigantic. When I Shift Tab in Rebirth, it only displays the current time and my game stats like how many hours I have in the game and such, and it's gigantic. It doesn't leave room to display anything else. I assumed it had to do with me playing Rainbow Six 3 in 800x600 but that doesn't make much sense. and the overlay in Rebirth is way more zoomed in than a 800x600 overlay.

This is just annoying, because I have the FPS counter enabled, and it's really big and noticeable on my screen when I play Rebirth and I can't disable it.