Sounds like you are running into the standard bugged client issue. This was more of an issue in the past when there was an issue with packets getting out of sync or missing a response from the server that the client is expecting.
What server code revision are you running, and which client are you using? Does the sync issue happen after doing anything in particular such as killing a bunch of stuff all at once? What are the stats of the server you are running on, and are you running anything else (or playing) on that same PC? There are many possible causes for that type of issue, but mostly it is due to flooding too many packets to the clients like when doing mass killings, or when using a feature that may not be fully implemented like a special type of merchant or something. It could even be due to a spell issue or just about any number of other things.
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