1.Mark a variable card in logical programmer GUI any operator card mark cell

2.Double click marked card in package
3.The Mark will become a real card in your package

Blank or assigned card Any items are can trigger this bug,

apply3 can copy 4 card once!

No, closed GUI still exist.
I said, "become a real" items.

I assume these copied variable cards disappear from the moment you close the LP gui?

I can't reproduce this. Did you have any other mods installed?
If so, please try reproducing this without any other mods installed.

I assume mods like mouse tweaker messing with this behaviour.

No, I checked if ID only, this bug still exist.

Gif here

Cannot stack item can't be copy.

Ah ok, you double click on the item inside your inventory, that wasn't clear to me.