My friends and I are playing a multiplayer campaign and every time we save/load there seem to be sync errors. Some items will get duplicated and some will completely disappear. Whenever we roll initiative, the game desyncs; so we have to load the game a lot.

have a same issues/ items are randomly disapearing, even equipped

We're having the same problem. In our case it is most noticeable in combat. For instance, on my screen the monster is dead but on the host's screen, the monster still has some hit points left. (Or vice versa.)

Our workaround is to save often and when we see we're out of sync, we reload. Needless to say this is rather frustrating and irritating.

It's almost like there are two games running at the same time. Perhaps if there's a lost network packet it loses track? I don't know, that's just a guess.