So lately Ive noticed that all the NPCs in my game that walk around on patrols with weapons will occasionally stop and then their weapon fades away. I didnt really care because it did not bother me from playing. But recently Ive noticed things such as; when following Sunny Smiles at the beginning of your game to the Geckos she would stop and stand there with here weapon gone just vanished then after a few seconds she would pull out her weapon and start running again. And now I am noticing that some NPC do this during a fight and will start punching with their fists because their weapon has just disappeared. Anyone have an idea why this is happening and any solutions?

Edit: Also I will add the way the weapon is vanishing.
       So the NPC will be walking/running and then stop holster the weapon and as soon as it is holstered it disappears. Then after a few seconds if they are not in conflict the weapon will appear again on their back and they will pull it out and start walking only for it to all happen again in about 30 seconds.

Do you use any mods that change ammo, such as "NPCs Use Ammo?" It's also happened a few times to me when the enemies are carrying weapon mods integrated into the leveled lists.

Yea I have the NPC's consume Ammo mod Ill deactivate it and see if it stops.