I can't write anything on signs, books, or anvils in my realm

I can't write anything down in my own Minecraft realm, I created it a few days ago and had no problem writing anything down, but yesterday all of the sudden, I couldn't write anything in books, on signs, or in anvils, anything I wrote would either be removed or in the case of the anvils, be replaced with hashtags Ex: ("Diamond Sword" would be replaced with "############") despite that I could use the chat function though. This is starting to become really annoying, I think its only happening to me, and i don't know what I might have done to cause this problem, can someone please fix this.
(Footage was sped up so I could attach it)