[wgstarks]

You can stop XBMC updating the playcounts from trakt tv.

In the trakt addon's configuration settings, go to the Synchronize tab.
Under Movies, uncheck Update XBMC Movie Playcounts.
Under TV Episodes, uncheck Update XBMC TV Episode Playcounts.

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I find the trakt synching useful for keeping different clients in synch, or being able to restore my play history after a a database wipe. Here's what you need to do if you want to keep using that aspect of the plugin.

If you want to delete the entire trakt.tv database, contact their support. They will delete it for you, and the plugin will rebuild your data next time you run it.

If there are only a few episodes and movies that are incorrect, you can delete the watched status manually in the website. But it's tedious, you have to go to the history tab, and find each movie and episode you want to delete, and click the cross in the top right. You'll get a warning, just click yes, do it.

Then check that the watched status is correct in xbmc.

Make sure both trakt website and xbmc are showing the watched statuses you want, before you use the synching aspect of the plugin again, and they'll stay in synch from then on.

Thanks