@Driftwood Regarding
I just noticed that the current version here (unlike the one your originally uploaded) only has audio in the R channel.
I downloaded the .MOV file (to make sure it wasn't a Vimeo issue) and also played back the "Graded only" and "Ungraded" versions as control checks. Only the comparison video had the issue, and the issue is present in both the streaming Vimeo and the downloadable .MOV.
Illl upload over the top another version, guess I must have switched off one of the channel's in the nle by accident or pushed it to the R by accident somewehre!
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