[MeMeMe]

Could anyone confirm that mark unwatched also reverts to watched for them using this addon?

If you mean that:
a) you have watched a program, and that is scrobbled to trakt
b) you then mark it as unwatched
c) and then it gets marked back to watched

then this is standard behaviour with the plugin.

You can change the sync settings in the Trakt addon settings -> synchronise.
Look for Update XBMC TV playcounts and Update XBMC Movie playcounts, and uncheck them.
That should stop it grabbing the watched status from the trakt site and reapplying to xbmc (if that's what you're wanting to achieve)