If you spin first and win a single scratcher, the game won't award you one. You already have a scratcher from your yearly membership, and the spinner thinks it gave you one, so you get cheated out of a second scratcher, which you should have gotten. This happened to me last night. Spinned the spinner first and it said I won a scratcher, but I already had one so the game didn't award me another one.
I don't know if this happens if you win multiple scratchers, but it did on winning a single scratcher.