I once competed at alot of the same places as Roger Fisher, and maybe he knows. There was a fellow that would always staple one side of his target to the backer and then bulge the target out away from the backer before stapling the other side. He did it at every match, every target. It always held the middle of the target about a half inch forward of the backer. Once up at Jacobsburg about 1985, I saw someone pull the corners and staple it flat, thinking they were helping him and he got pretty huffy about it and put it back with the bulge in the middle.
What earthly purpose could there be for doing that?