so many inventory bugs in one video all in short time. watch the whole video (only 04:24)

there are multiple issues.

my old backpack is gone and only my friend can see it.
my magnum is gone (but it is in my hotbar)
after the magnum issue i had 2x repeater (no dupe)
after some minutes i cant use my axe and hotbar did not work anymore
after the hotbar issue and axe problem i cant take off my axe

https://www.youtube.com/watch?v=TNAnTvCZWHU&feature=youtu.be