So I had a corrupted save because of too much installing, uninstalling mods. I used fallrim tools and save cleaner ctd fix to fix the save. It worked and the save runs smoothly right now.
But the problem is my character is not using olivier sprint 2.1 animations when weapon drawn while npc character is using the animation. Got to admit that, I removed and installed too much animation mods to this save to fix the other problems. They are solved however this one persists. I reinstalled olivier sprint countless time, didn't solve the problem. I used Fnis Pcea2 and unintalled it. I am saying this because this is the only mod separating which animation mods to be used by the player only. But I don't know if that is the problem.
I am using vortex. This is the first time I am using Nexus forums, this is the most relevant place I could find to post this.