Your derailleur hanger might be a little bent. It happens to me pretty often as the bike gets a slight beating in the locker room (too much stuff in there).
It's not the end of the world. Just go back to the shop. It happens to me often that I'll get my derailleur adjusted and it doesn't work perfectly right away (I'm fussy, I like it to be very very sharp) and I just go back and they tweak it.
It doesn't mean they are idiots.



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Don't mind the rain so much but don't like wind.
