Sound glitches when I pull out my sword

Solution 1:

This is one of those "it just happens sometimes" Bethesda bugs I've seen pop up. Usually, it's because either a weapon mod tried to bring its own idle animation with it, or an animation mod in general has failed to load properly. It can also happen just because, and is actually less likely when using modded-in animation sets. If you're on PC, I strongly recommend Fores New Idles (FNIS) from the Nexus; it fixes a LOT and vastly improves animation quality.

If you've got no mods installed that affect animations and this happens, most of your options involve the PC console. You can try to use the resurrect console command to forcibly reset the follower. kill can also be used to force essential characters into the "bleeding out" kneeling stance, which can fix broken animations.

Gameplay fix options include simply dismissing the follower and seeing if resuming their daily lives fixes them, as well as "sprinting" into them at full speed and making them do the "knock back" animation. Both of these fix a LOT of animation bugs that are inherent to Bethesda games using the Gamebryo engine. The first word of Unrelenting Force, "Fus", can fix them as well. You can try a full "Fus-roh-dah" and blast them across the room if that doesn't work, but they may not want to be your friend no more if you do that. The problem can also exist with the weapon. I had a follower once who was someone's first project that did something similar to this every time they tried to draw a hip-scabbard weapon like a sword or knife. They had no issue with greatswords and bows, so I robbed them blind and gave them equipment that didn't glitch them. In another case, the source of the issue was the actual mod that brought the weapon in; it had a custom animation which seemed to be broken.