I just reinstalled Realism mod haven't played with any settings. But recoil is kicking downwards on any fire selection. I saw a reddit post that some people were having a similar issue but no solution about 7 days ago.
List of mods:
Questing Bots
MC-Deagle
MC-M60
SVM
Looting Bots
Realism
Swag
WTT-armory-m67
WTT-armor-m249
WTT-LittleDrummeeBoy
WTT-sianydeandScorpiness
zSolarint-Sain