Help with syringe and skill checks

Hi everybody!

I have this problem: When I equip the Styptic agent or the Syringe with a Med-kit, the moment a skill check pops up and I hit it (good or exelent, doesn't matter) the add on is used and the Med-kit wasted.

What can I do? I can't separate the bonds for the addon and the skill check so I don't know what to do. Isn't it supposed to only work when not on a skill check?

Thanks.