Varys fetches the history from your Plex server and displays it without modification. Unfortunately this is a know issue with Android clients and not related to Varys.
The good news is: There's a workaround for that issue! You can remove the item from your library, update the library and add it again. Varys can help you doing that using the "Plex Dance" feature within the app. It will guide you through the steps and will update your library automatically.