Happened a couple of times with me after a trade some gear had their stats doubled. That “bug” would stay until you log off that game room.
Topaz gems had doubled effect also some runes also had it.
If needed I can post some gear with doubled effects, just let me know how to upload it or what kind of image share I could use.
just for the record, the gear itself wasn’t traded. Mostly would be runes or gems in the inventory.