I just purchased 2 MP 60’s for my new tank with 3/4 inch glass. I used the medium rubber spacers and removed the stickers. When I try to line up the motor and the wet sides together, they won’t line up. I can get them to stick together and stay connected and stay put but the motor is off to the side of the wet side. I’m worried they won’t stay connected and the motor falling off the glass. Am I doing something wrong or is this how they mount together. Your input is appreciated.