I'm not using FNIS.
I have Zazemel's Drow Race, however the problem occurs on default Redguard race and Khajiit.
I downloaded "Immersive Animations - NMM Installer - Complete Pack v2.0"
I downloaded "Dual Sheath Redux v1.6b"
I downloaded "XP 32's Massive Skeleton v1.81"
I have SKSE v0.1.6.15
I have Skyrim v18.104.22.168
I have Dawnguard
In the XPMS installer I made sure to check the Back Hip Dagger option and the other option after it.
I installed IA first, then XPMS, and finally DSR. Then I install the animations below knowing (through checking data files present in the zip files) that none of the dual wield nor dagger animations/meshes are being replaced. Mystic Knight alters RH 1h melee + LH spell animation, which has affected maces, swords, axes, and daggers (since it alters 1h melee animations). Mystic Knight alters 1h sword/melee and magic, Zweihander alters 2h sword, 360 W&RP alters third person sheathed-weapon movement, Bowlegged jump anim Fix alters jump.
The current animation mods I have are
Bowlegged jump anim Fix
YY Anim Replacer - Mystic Knight
YY Anim Replacer - Zweihander
360 Walk and Run Plus
Dual Sheath Redux
The sheath animation for dual wield daggers works 100% perfectly. The issue is the mesh of the scabbard, it's on my left hip. When I sheath my dual daggers I go through the motion of putting them right above my butt, however the dagger (singular, right hand weapon) appears on my left hip.
I do not have any mods that change default armors, I am currently wearing Elven Armor on my Drow (female), I am wearing Orcish Armor on my Redguard (female), and I am wearing Nightengale Armor on my Khajiit (male).
Need any other info? Just ask, I'll be happy to provide more.
EDIT: Actually, I think I may have found the culprit. My Java was v6.22, DSR requires v7.21. D'oh!