The first problem is you didn't bother describing your OS, browser, device you're using (PC, MAC, whatever) or ISP. BTW what is your clock supposed to sync with? Real time? Your opponents clock? I'm unclear on what you're saying here...
See if anything in my blog helps, such as trying another browser or clearing the cache, etc
My clock dose not sync well - time suddenly drops in bulks without correspondace to actua move time... anyone ran into such a problem?