THTG RULE?

A local bakery had excellent stuff. I watched and ordered it successfully about three times each week. The proprietor said “Oh it’s you again.” When I next put in an order it was cancelled, but about an hour later it was up again. I suspect she’d was blocking me. Is there some rule or practice about frequency of use? A teenaged girl sometimes beat me by watching the time and tapping the second it went up. The bakery just stopped offering things on THTG. Is this normal?