Resident Evil 5 Online Coop issue (kinda)

I am playing Resident evil 5 on coop with a friend and we noted a issue with our inventories and ammo, they don't match, sometimes his ammo is shown to me as 0 but then he say to me he has 99 ammo, other times i check his inventory and he has 2 of the same weapon.

I also noted his ammo going from like 12-13 to 99, we were playing and he found 70 shotgun shells.

WTF IS HAPPENING!!??

We did a test, i took a screenshot of what his inventory looked like to me and he showed me his inventory, and they were completely different inventories.

His inventory in my vision

His inventory in his own vision