Actually, I'm having this problem on the device as well as I mentioned in my post. I'm not able to screenshot it because it addition to appearing as it does above, it disappears after about two seconds. I've created a video though. It looks like a loo but I'm just robotic :).
https://www.dropbox.com/s/54gviij65wjnetd/DateTimePickerBugDemo.mp4?dl=0I'm currently attempting a workaround by using a separate picker for date and time, then combining into a single Date. It actually looks nice on the form that way. Just a bit more code.