There are instances where an item although appearing on the ground nearby is actually inside someone else's inventory - had a similar problem earlier today with a pair of boots - ping/latency and desync were all fine it was just the server going slow - in the end the server let me take them after about 2mins

I am sorry to hear of your ban however - could you write the reason again as I do not understand what you mean. The English language may be difficult so perhaps if you wrote this in your own language as well we may be able to see what you mean.

I am sure the Devs are multilingual.

Write again in this thread.

I am not a dev.