No problem with my top cap. It could be soap residue so try a damp cloth and rub it to see if it disappears.

To find the correct angle for a DE, place the top cap on your face with the handle parallel to the floor. Rotate the handle downward till you just feel the blade. Even the the top cap is in some contact with your face. If it weren't you'd be scraping the whiskers off more than cutting them. That would be very uncomfortable on your face.

Bob