Hey folks, i give you the code and stuff, then i explain what happens.
The code:
The console (read from bottom to top)

As you can see, the first time, it picks RustySword, apply a tween, and result with “Att 1” like it should be, bc it applied the tween on only one item.
Then, next click, still picking only the Rusty sword, but for some reason it resulted with 2 items in the tween, i don’t understand how.
Health and RustySword are in the group Items