I don't know what happened.
MC-66864
Sign display error
Resolved
Duplicate
0
Niklas Peter
(Unassigned)
Unconfirmed
Minecraft 14w32d
Retrieved
Well, if you went further from the sign than your render distance, it probably would happen but just exit the world and enter. All will be well until you went further again.
No, it's not a duplicate of MC-62166.
I'm just here to clarify. I'm not an expert or a tracker.