1967 Chrysler 300 Convertible Top Question

[67_300_Convertible]

Why does the convertible top bow at the top of the back glass? How do I get it to lay flat?

Top was replaced around 1990 but the back glass and vinyl around it is original.

 

[SPF Required]

I have a ‘68 300 and it doesn’t do that. Mine was also replaced in the late 90s. I wonder if yours is rolling back on itself a little when the town is lowered? FWIW, I am pretty sure I bough the top and back window through Year One at that time.