So, these are advanced information panels from Nuclear Control. I was temporarily using them as a message board on my server, left the game for a few minutes came back and this :/
So it is a ghost block it obviously glitched out completely and can be clipped through. Problem is now, it is permanent there, a ghostly facade of a message board. I tried fixing it by placing blocks where the ghost blocks are in case they would disappear and I created this monstrosity:
So yeah :/ any info on why this could have happened or how I can fix this would be much appreciated XD