I have had the same problem in server 5 when we have more than 1 battle (which is every day). As host I do battle planning before guilds warfare start. When we go into guilds warfare during event time, most guild members end up randomly reassigned to a city I don't need them in. And it's not just me. The same issue happens when one of my VHs does the battle planning for the guild. We have lost cities because the server decided to take out the defenders we needed there. Please fix it.