Synchronised Dialogue echoes when copied into new sequence

Hey guys,

I'm currently cutting a documentary where I set up an assembly timelines for all the interviews. A set of interviews comprised of two people next to eachother both with dji mic's recording. I then sync'd them all up with the scracth audio from the camera. That all sounded perfectly fine.

But once I copy and paste that interview into a new, unedited timeline; the sync'd two dialogue tracks from the dji mics give off a horrible echo. Like they're not properly synchronised even though I just did it. What makes matters worse is that moving the tracks using audio time units doesn't help either, and using the synchronisation feature again in premiere doesnt do anything.

Has anyone else come across this issue before? Any help would be great.

Thanks,

Harvey