Whenever you place a sign, particularly with something that has a many characters, it changes the sign to a different text to the one you typed. I have a feeling it could have something to do with the profanity filter but that is not my forte

Steps to Reproduce:

1.) I placed the sign and typed the following

"5,000C
For 64
Instant Damage
Arrows"

2.) I stopped typing, and exited the sign menu.

3.) I observed what the sign said in-game. Which was, the following

"###### For 64
Instant Damage
Arrows"

I am not sure why this is happening, and it only seems to happen in Realms and not on a local game. And also to be noted it wasn't only happening on my computer, it was also happening on a friend's console. It is very frustrating, and I hope you guys can do something about it.