Assuming this is regarding AC bonuses since Iron Bracers do give a number of "Buff"/bonuses and the bug report was not very detailed
There is nothing wrong. I just tested. You just have to unequip and re-equip.
Bracers give AC (armor modifier bonus)
Armor bonus of same type (excluding dodge) do no stack.
Equipped medium armor +1
Equipped Iron bracers +1 AC vs Outsider
Bracers "lose" the Armor Bonus +1 (AC Armor Modifier)
Unequipped medium armor
Equipped Bracer and the property has returned and AC is modified.
Ended up making another trap several hours later. It worked just fine. No reset between. So idk. Shrugs I don't think it matters at all, but when the traps stopped working, it was during the sewer Goblin quest.