I was killing zombies with MK II pistol with magazine. I have killed one zombie using this gun. Then I have made some interactions. Later I experienced ghost bullets and inconsistent number of rounds in magazine.

00:07 - I am killing zombie with pistol
00:14 - I am taking magazine out of gun into inventory, I am filling the mag and reloading
00:32 till 01:12 - interacting with inventory
1:29 till 1:48 - ghost bullets, bullets have no effect on zombie
1:50 till 2:02 - taking magazine out of gun into inventory, unable to fill magazine when holding R button
2:02 - I am trying to empty the magazine and number of bullet in mag. is changed suddenly from 1 to 9 then 8, 7, 6 .....
2:20 - filling magazine again from 0 to 10
2:46 till 2:55 - ghost bullets again
3:10 - unable to fill magazine again
3:12 - I am trying to empty the magazine and number of bullet in mag. is changed suddenly from 5 to 9 then 8, 7, 6 ...