I was wondering if this was a common issue or not. I just got a bag of 100 axles from show in Altoona. Now I'm guessing it was probably from the show circuit, packing and unpacking, being picked up, put down etc but I just finished swapping out axles and had at least 25-30 axles where the wheel was already off the axle or fell off when I tried to install it.
I have mentioned this before, but it bears repeating. If you email or call FVM, they should replace those. I had 9 bad ones in a bag of 100, and although they did not answer my email, about 2 weeks later, 9 replacements just showed up in the mail.