Very infrequently, one of my non-active Keyclone windows will spin around anytime I move the mouse cursor to that window.
Pretty much the only way to fix it, is to press the PiP key for that window, and then to double mouse click so the character moves forward.

I don't know what causes it, but for example opening the gryphon flightpath's on all clients or a vendor window to sell junk and repair, will rarely cause this.