Slide toppers can puddle for a variety of reasons. One reason is the length of them and another is the tension.
I wouldn't mess too much with the tension unless your familiar with doing that kind of thing. It's a delicate balance of enough tension to allow the topper to unroll without pulling the fabric out of the rail and enough to keep it tight.
I have seen lots of toppers puddle and we generally leave them alone.
BTW: Welcome to the forum!!
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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