Gold-plated battle mail bug

I'm a cloud giant ranger with the gold-plated battle mail that gives perma enlarge when worn. However, it seems that for some reason it has taken away my natural giant resist physical whenever I take it off. I have verified this several times with testing, as mobs and PCs will hit me with say.. DISMEMBERS when I take it off and devastates/mauls etc when I put it back on. This is sort of irritating as I don't really wanna wear it all the time, but am sort of forced to in order to keep my giant resist.