Weight to Fat Loss Data Problem

Celtic_Ace

current Goals
186 weight 181 176 171 166 161 156 151 146 141 136
27% BF 26% 24% 23% 21% 20% 18% 16% 14% 12% 9%
50.22 lbs of fat 46.47 42.72 38.97 35.22 31.47 27.72 23.97 20.22 16.47 12.72
lbs lost 5 10 15 20 25 30 35 40 45 50
lbs Fat loss 3.75 3.75 3.75 3.75 3.75 3.75 3.75 3.75 3.75 3.75
lbs LM loss 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25
Muscle Mass 134.53 133.28 132.03 130.78 129.53 128.28 127.03 125.78 124.53 123.28

Faults that I see with this simple formula is that weight decreases % of fat loss should also decrease and I have it at a static 75% of total weight loss. Thinking it should drop