This didn't happen when I first used PI3. But now when I try to animate emitter nodes (or whatever they are officially called), they don't stay where they should. For instance, I start with a number of nodes in one place at frame "0", then move to frame "20" and move these nodes. But when I go back to frame "0", the nodes don't return to their original position. they are now in the frame "20" position. But the other weird thing is that this doesn't happen to all the nodes.
FYI: I am using a lot of "nodes". For instance, in this project, I have two sets of nodes (each set of nodes connected by a line) and each set has about 30 or 40 nodes. I hope I am not confusing you with my terminology. The emitter I am using is "flames" from the "fire_01" library.