its common for alloy ones to corrode and stick to the valve. in some cases it will be so bad that you have to take them to a tyre place and have them cut the valve and then deflate tyre and fit new valve and remount the tyre etc. I had this happen twice to that point and even using copper clip etc on the caps this still happened several more times where i got them off but not before destoying the caps. I got so hacked off with it that in the end I've gone back to black plastic (which as I have a black alloys doesn't look too bad )
This is the most unprofessional bit of site management I have seen since I was banned from a certain other site...at least they had the excuse that they were enthusiasts who had strong views and not professionals paid to keep thier cool!
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