It's a weird thing, I've not seen that issue and I've assembled a few different makes of armor, RS, AP, AM and ATA, never had any reaction and in places I've gone overboard with the E6000. I have also used magnets, clamps and tape to hold the plates in place still without any distortion.
Still wondering if there is a reaction with the coating on the snaps, we use Birch snaps here down under and don't have access to the Tandy snaps.