CK II - Attacked in war for province that does not belong to me

[Evangeline]

One line summary of your issue
Attacked in war for province that does not belong to me

Game Version
3.0 Holy Fury

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
My muslim neighbour has just declared a holy war against me for the province of Sous... which is his own province and doesn't belong to me at all (see screenshot, my lands are in blue).

Steps to reproduce the issue.
Not sure how to reproduce, but I'm attaching a screenshot and savefile.

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[michx0]

Holy wars are declared on duchy level titles (except Buddhists). Does your county by any chance belong to duchy named Sous?

 

[Evangeline]

Oh, the de jure duchy is Sous, you're right. That clears this up!