Contacted Peragon and this is the reply i got,
"The cover is a water resistant product and not waterproof as stated in the FAQ and Features pages on our website. Leaking will occur along the rail where the panel seals intersect the inboard rail seal. It is impossible to get those two seals to mesh closely enough to prevent water from dripping past that point. The water then may travel underneath the panel, along the panel seal until it drips off from what appears to be the center of the panel. Water tension can even permit water to run slightly uphill. We're not saying this is happening in your case, just that it might be.
Pictures are worth a thousand words and we would be happy to take a look at your cover. Please view the attached photos and send them along with any photos you have taken. This will allow us to look over the install and view the seals on your cover to see if any adjustments can be made.
Let us know if there's anything more we can do to help you." Of course I sent photos of mine with description and haven't heard back.
Wasn't expecting it to be waterproof but wasn't expecting soo much leakage either. Seeing water in the corners near the cab of truck, to me the rubber grommet that overlaps from rail to front of bed doesn't overlap enough. I get drips off just about all panels along the seals and I have the step in the tailgate so of course there's a slight difference in the seal meshing with tailgate. I'm gonna try to move everything a little closer inward and back towards the tailgate later this week, weather permitting.