Well, i made another file and the symbol itself is not moving because it's position in the motion editor is always the same, but I noticed the anchoring point(or whatever it's called) keep getting farther and farther from the center of the symbol.
The only way i keep things under control is by using the multiple frames button inside the symbol and move everything back where the stage is. At this point it's just a bug, because there's no reason for it to move only when i open the project up, not while i'm working on it.
I'll animate stuff and make the "pan and zoom" symbol after i finished everything. That should solve. lol.