Any info on the source of that text would be greatly appreciated
If it's quest or text link-related, we can look at server code..as well as any nullptr or unallocated references - you may see 'stripping' in that
case (something like '00 CC 00 CC' or whatever variant the os uses for deallocation marking.)
If it's being generated by the client itself (no packet injections,) I can test that with two clients and changing the default font..and maybe
some other testing.