I moved a minimal background I had to another layer, then decided to just delete it and remake it on that layer, better than before. I made a nice background, and then I went to test it out, and moved it back to render it, and it showed the same everything I had last time! Nothing I had deleted or added was changed! I added and deleted a few things to test it out, and the render stayed the same, no matter where I moved the camera, or moved on the timeline.
I have no idea what to do! I saw a bunch of people say "Maybe you used H to hide it instead of deleting it."
I tried the solution and it didn't work. I've been using X to delete everything.