https://i.maga.host/byvieSj.png here, I agree that it's not correct usage, but it's actually coming from Scottish immigrant dialect. No idea why the "to be" is left out there but I've heard youtubers from Scotland doing the same thing. "This really wants repaired," for example. So it's not really a your / you're, there / their / they're, kind of mistake; can't blame it on fluoridation and common core, basically.