Negative numbers are sorted backwards in Peak Level (R128). For example, it will go +5,+4,+3,+2,+1, +0,-5,-4,-3, etc or -0, -1, -2, -3, -4, -5, +0, +1, +2, +3, +4, +5, etc. I'm not sure why, but I have both -0.0 and +0.0 values entered for songs. Due to the sorting bug, they aren't sorted together.