I paste between sequences a lot and I can’t say I’ve seen this happen when the dimensions match….not helpful….I know.
Can you Remove Attributes on the ones that got messed up then copy and Paste Attributes from the original sequence?
Does that work? Or does it get screwed up again?
PS: I always use multi-channel sequences. For stereo sequences, I just set it to 2 channels. This avoids the whole issue of not being able to change the audio outputs after the fact.