Rueben

I have a recently restored 1976 '02. I had a local shop near Atlanta do the restoration (Tom Sawyer Motorsports). I've never had so much fun driving a car except for one thing...the newly installed headliner droops at speed. It was annoying during normal outings but became a real problem last year when I put it on the track at Road Atlanta. With a racing helmet on, the added inches and additional pressure of the headliner made it noticeably difficult to turn my head after 10 minutes or so. By the end of the weekend my neck was very sore. When I questioned my shop about it they indicated the headliner was installed properly and am unsure why it droops so much. It looks very well installed. When I press my hand against it toward the roof there seems to be several inches of space between liner and the roof. I'm not sure if this is normal or not. The original headliner was in good shape but old the restoration took almost 3 years due to covid, parts, etc. so I don't remember if the same condition existed on the original. Anyone have any thoughts or advise?