I just ran into a weird bug today. I started a new game, and by the time I was around the middle of the tutorial dungeon I check my attributes and see that my speed says -25(-32). I was gonna post my whole load order but I managed to find which mods might be conflicting. I use nGCD+Progress as my leveling mod and Duke Patrick's Archery mod and Realistic Fatigue (I use FCOM too). I am thinking that it may be Duke's Archery mod since I deactivated it and the problem didn't appear again (note that the saved game that had the bug already in it didn't get fixed, the lowered speed attribute stayed there. If anyone knows about this let me know. I'll post more info later when I can test this a little bit more with a fresh install. Thanks in advance!
P.S: Since I cannot say 100% that this is a bug from Duke Patrick's Archery mod (or any other at all) I can't post this on their official thread.