I was just messing around with my warrior's gear and switching between sets. I happened to switch to the Copperhead Str set, and then switched to my Hate set using the preset loadouts. The problem is that with the Copperhead set on my Str is 155 and all my Hate gear is shown as unequipable, the lowest Str requirement being 157, but the loadout somehow doesn't check for the attribute requirements being met before putting the gear on.
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