how to called 'what Changed words in the sign due to a few problems'?

[Homunculust]

Like this



What do you call all this?

 

[Hagatagar]

'Neon Sign Fails' or 'Signs with missing letters'?

 

[whatevsbro]

The signs have been vandalized, so you could call them "vandalized signs". You could also say "vandalized letters" or "altered letters"... "changed letters" "changed sign" etc.

 

[おい！]