Why does a screw loosen as opposed to tightening in time? Why doesn't the torque tighten the screw?

http://nelseaw4me.freeblog.biz/2020/03/25/cutting-sheet-steel-irwin-tools-steel-cutting-round-saw-blade-testimonial/

Set up the offset cleat along the eave, and then you are ready to install the steel roof panels. The offset cleat allows us to create a real covert fastener installation. You can learn more regarding installing