firewire

Just purchased the Sinn U1 with the Swiss Eta 2836-2 movement. Man having other Sinn gens, but not the U1 I was surprised by the heft of this rep. I am experiencing a weird behavior that I would appreciate if anyone could give me insight into. When you set the time and try to screw the crown back in, the minute hand goes backwards while it is being screwed in and the date-wheel advances forward making it very difficult to set either. I have emailed the dealer, waiting for a fix. Never seen this behavior before. Thanks.