Sure it does I am buying in bulk from the exact same supplier. Red, Kelly Green, Grape, Gold all curl. Black, Silver, Silver Holo and Orange don't.
It's not that it's a horrible thing, it is a great quality flake. There is very little that I have come across that won't curl. MF, Bear's, certain one's from LC, Spike-It etc. they are all very similar and certain ones will have a tendency to curl on you, some are better when you back off the heat, others there is nothing you can do. They do hold their colours very well though.