As I posted, I like the Extang, but a little maintenance is definitely needed, and part of it is what you just found, those front corners need to be properly tightened, if you over torque you bow the cover if you under torque you have a good chance of it leaking and or moving forward, a buddy was plowing snow, hit a bank a little to hard, the next think he knew snow was coming in from the rear, the cover smashed the rear window - he hadn't checked the cover for two years - he had meant to as he was noticing the front bed area had more water than normal after a high pressure wash. I check them every three of four months, not a big issue but something to remember, in his case the "extra water" was definitely giving him a hint!!!!