I think I got the same problem.
Playing with 5 characters, sometimes tabbing onto the first toon to check the inventory, tabbing back to the main. When I then press my xkeys Button "Shift+F7" Toon1 and Main are reacting as they should, Toon 2, 3,4 are pressing "Ctrl+Shift+F7" EVERY TIME (at least when it goes wrong) which will summon my fire elementals, to undo exactly that effect all I need to do is to click ONCE in every window of these affected toons and et voila - they're reacting as they should be.