im not entirely sure what causes these bugs but heres what i have noticed, when running in buildings, if the server spikes you can run through walls, gates, doors, and if you are walking next to stairs even floors. it gets a bit buggy when people walk to close in the same bulding with higher floors,your friends might even clip into you and push you out of walls and make you can fall to your death, the stairs in the tall buildings that show from cherno or balota can be tested to see how you fall through the floor,it has happened to me while going around the staircase while running/walking.