Skillers changing value in inventory

I was moving a skiller from one char to another, and a +light +6str turned into +summon +6 str randomly. I moved it from inventory to cube to look at damage, and then to shared stash, I switched char and I saw it was changed by that point. I have had this charm for a while. This happened to me a week or two ago but I thought maybe I just misread the charm since it went from +pcomb to +bcomb. What is going on? I have never heard of this before.