Edit.
After hours of traials of finding a culprit I have finnaly found one thanks to a user that mentioned MoveTo SetPosition commands.
This mod was a culprit:
Hello,
I have a strange bug.
After the sex has ended NPC is catapulted into the space, and then falls down exactly where it has been on the ground. As if they're being teleported. For example if the initial posion was X: 0, Y: 0, Z: 0, after the sex the npc is teleported to X:0, Y:0, Z: (who tf knows) and then falls down