Signs Resetting after Relogging

When placing a sign in MCR I can see the sign but after coming offline and back online the text is immediately forgotten even if just logged out for a brief second. all my signs from before the world was a realm work fine and show text like they should only signs made since the world is a realm won't keep there text

 

What I did - 

joined realm

places sign and added text multiple signs or one

log out of realm

join realm

signs are there but blank with no text

 Images below showing the signs i realised wasn't working after relogging.

Edit: this is inconsistent and now sometimes the sign wanna work and sometimes they forget how to work, not chunk error cause happens in places where signs are in the same area some work and some don't.