Webcore create duplicate piston showing wrong list of pistons

I'm using remote subscription and attempting to create a new piston based on an existing piston...I'm signed into my Dad's hub and have registered the browser ...but when the list pops up its from MY hub.... I've tried registering the browser and a different web browser but no matter what I cannot pick on from his hub

Have cleared out all the browser data?

See notes 2,3,4 in this: