Why does the roll bar come up as I am driving when the roof is on the car? on 1990 Mercedes-Benz 300SL

It just started this about a week ago. I checked the fuse box and all the fuse are good. I push the roll bar back in place and as soon as I make a turnthe roll bar comes up. Is this a problem that a should be concerned about?

Asked by for the 1990 Mercedes-Benz 300SL