As seen in the above image, when holding Shift down to compare the item to one I am already wearing, at least three copies of the comparison window are displayed. This renders the whole feature useless and unreadable.

Worth mentioning this is in the ATM10 modpack. That pack currently uses version 8.3.4 of your mod.

This happens if you both have the Equipment Compare mod installed and have apoth's equipment comparison feature enabled. Since they both do the same thing, it multiplies off of eachother. Seems like a modpack issue if they have both.

Turns out the devs of the modpack agree with you in saying that it isn't your fault. Sorry to bother you