I'm really confused by the problem, can you add pictures?
~ @shains
When you misspell or leave out your current IGN while making a shopsign it will now revert to it's old name.
Like if I leave it blank right now, it'll have the name 'monkeyhead1999' on it instead of 'Muunkee''
It only happens sometimes and sometimes you arent able to destroy the sign without using /plot clear