Hey, I’ve had this for a while now, and it’s pretty annoying.
It’s where, when I am making an animation for a sprite, sometimes when I make a new frame, it reverts to another already made frame, like; say I’m done with frame 19 and I go on to frame 20. Frame 20 may have the sprite of Frame 4 for example. I want to know how this happens and how I can fix it. Please help.

well to fix it you can go to frame 19 and click on copy, and frame 20 and paste it. then just edit off that.