AE playback/preview will not show my recent edits/throws off all timing, I feel insane.

I am so frustrated. I cannot find any other question like this. Right now I'm using a 3D layer with images going past a camera. Images are in a pre-comp. Simple. However, when I swap out images and play back my sequence the preview will reset and only show the old edits AND it doesn't make sense in terms of sync/placement. This is extremely frustrating and happens in other projects that AREN'T 3D as well. I've tried so many things to fix playback errors, nothing. Even upon closing the program and opening up, the initial view is of my current edit, however upon pressing play there's the wrong images again. 

I don't get any error messages, nothing. I just get to feel crazy.