Items with random stats will morph if they are swapped between inventory sets. The random stats are saved in the items.000 file, which can not be swapped without morphing all of your existing equipment. For the dragon/silver armour this is ok, since they get completely replaced when upgraded.
I'd suggest just keeping an eye out for a better set of gloves, but keep the dragon gloves so you can complete the set (the first time you wear the full set there is an experience bonus and you learn a level of Elemental Hail, IIRC).
Alternately, if you don't mind cheating;
DAD's item editor
