server version: 1.14.4 paper(243)

• OldCombatMechanics version: 1.7.4 1.8.0 and 1.8.1
• Server Log File: no logs concerning old combact mechanics
• OldCombatMechanics config file: click here for a google drive files

Issus is related to offhand armor duplication or all items could be equip into any armor slot.

Steps to reproduce the behavior:

1. take a armor item into your offhand and a sword (melee weapon) into your main hand
2. try to shield using the old combat mecanics fake shield will replace your offhand items
3. your armor was in your offhand will be equip before the shield replace it. when you stop shielding it will bring back a copy of your armor in same time its dupping it.

what is suposed to perform is not dupping it by not trying to copy armor item but i can understand forcing a copy of the item. i think by working a bit offhand replacement ticks would help a bit.

im prety sure other version than 1.14 are concern too

There is a short gif files showing you the exemple stored on my dedicated server
https://idryt.pandacrafts.ca/20200711073550.gif

I'm assuming you have the disable-offhand module disabled? I can't actually see your config file, it says access is denied.

Actually yes, I managed to get the same effect with a shield. But as soon as you try the item, it disappears.

@dryter97 I can reproduce the visual effect. But when I try to click on the equipped boots, they just disappear. The item is only duped on the client apparently.