I got this problem when using RX Connect on multiple clips more than once.
for example:
- I got 10 clips
- I select them all
- send them to RX Connect
- Do my editing
- send them back
- all good
- select them all again
- send to RX Connect
- do my editing in RX
- send them back
- messed up clips
selecting just one of the already with RC Connect edited clips a second time works.