Sync between media devices

I run a mac mini server, with my media on a Drobo.

Problem is when I start to watch someone in one room, stop it, turn off the tv and go into another room, I cannot start where I left off. In fact, it shows the movie as unwatched, and not an option to start from…

Is this a known issue?

And you login with the same account? No guest account enabled? You have local authentication enabled so that Plex forces all to login?

yes, same account, no guest and local authentication is enabled.

That is really weird. Which clients are you using on these two devices?

it is between two relatively new Samsung tv’s, using the Samsung app on both. But, I tried with my iPhone too, and it doesn’t seem to sync either.