Cookie Decorating

Last night we ( I should say I ) made homemade sugar cookies. Yum! I had picked up some cute sprinkles and cookie decorating stuff and we spent the evening decorating the sugar cookies. It's been so cold here in Utah that I've been trying to come up with some fun indoor activities. We definitely had fun!
I can't figure out why my sugar cookies don't ever stay true to their shape, if anyone can share some helpful hints I'd appreciate it!