This in a shop window just before Christmas.
The vacancy can’t have been for long as the shop, which sold utter tat, has now closed.
One of those places where you might buy a shirt in a box and find no arms on it when you open it on Christmas day, or even worse, someone else does. You would , of course return and expect an exchange or money back, but tough, that outlet has now gone.
I’m no expert at English, and grammar is not my strong point, but you can see from this that whoever did it was not entirely confident either.
Maybe there was only one vacancy but then someone else left? You wouldn’t want to cross out/ do again would you? Especially if you were so short staffed!