I would have to see how you have the rear straps attached. I have had no issues with mine and I have run it year round for the last 2 years.
I will try to post pictures of how mine are done, but what I did was after wrapiing it around the seat belt and roll bar , I got is nug and then wrapped the excess strap around itself since I hate the tails blowing in the breeze. Makes it much tighter and also keeps them from slipping and loosening.
4.0L, 5spd, 4.25 Zone lift, Currie Anti-rock, Trutrac D30, D-locked D35 w/4.56 gears, MCE GEN I Flares, 33" Trxxus ATs, Engo 10K# winch, rear disc brake conversion.
My idea of help from the man above is a sniper on the roof.