Have been watching Doc Martin for a while on various platforms.
moved to Roku for season 6, and first episodes 1-4 are fine but then things get out of sync.
Episode 5 link plays what seems to be episode 6 (going from the plot summaries), and vice versa.
Rest seem to be ok.
Thanks for the post.
I'll pass along the information to the appropriate team to investigate further.
Thanks,
Danny