I would check your key bindings or your equipment to be honest. In the early days of Legion a number of follower items were named after abilities. Having these in your back pack would cause GSE to trigger these events. Also it may be a recticle based trinket that has a targetted use effect.
If its just one character then its not GSE doing it. GSE is triggering the problem. Clearing the WTF folder also resets GSE so if its still occuring its not a corrupt macro.