The only thing I'm seeing is the upper spring hooks have been 'bent' open a bit. Maybe they lost some tension because of this and they're not able to keep the brake shoes together all the time. Just a guess and doesn't explain the tightening of the wheel nuts issue.

Also the lower green spring is in a different hole than before (left, in the pictures). I *think* to recall it should be mounted more horizontally across, to the same hole in the other brake shoe, as to provide more tension.