Rear cam locks are not retracted
There are 5 tie down points on the top. It sounds like the rear 2 are not "disengaged". Be sure all 4 tie down spots ore accepting the "bayonettes" then tighten them down before securing the rear ratchet hook.
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si