Yeah, that's how mine was.

I'd read all the stuff about boiling the blades, balancing them etc but to be honest I figured it was probably heli fanatics that had to get THE perfect hover. Keep in mind I'm new to this. I never figured it would be a legitimate concern.

I can see the blades being a bit warped, cool too fast to slow whatever but I would have figured the weight would be constant as long as the molds are all the same.

I'm believer now, that's for sure.