Tweens switching symbols

Hey,

I have a Flash animation that's broken into two parts (due to length) that now have to be put together and exported. However, when I copy and paste the frames of the second part at the end of the first part, the tweens in the second part take the symbols of those in the first (i.e. what should be a body is suddenly an eyelid from an earlier scene). I've tried making sure the tweens from the second part aren't on the same layer as the first part as well as inserting a scene between the two parts so that the tweens aren't near each other at all, but still every time it swaps things out and changes them.

Anyone know how to make it stop doing this?

Thanks!!