When you open your WorldOfLogs link, and click on the Logs in the top left corner, you will go to this page and as you can see, the guild linked to this log is located on EU-Uldum realm. When someone creates World of Logs account, he/she is asked for realm and guild name, and all uploaded logs are linked to that realm. So, if you create WoL account for your character on Uldum realm, and then use the same account to upload logs for your character on Dun Modr, this error will appear, because WoL will still think that you're playing on Uldum. In WoW combat logs, there are no indications on which realm you're playing on, so therefore it's impossible for WoL to know where your toon is, unless you instruct them.
