I had something similar, i reported it to support and the fixed it and gave me the war chest rewards i had missed from the bug.
I did mention it on here last month, but just got some smart mouthed replies.
There is a bug in war participation in relation to doing the 3 kingdoms event, but no one seemed to care or care to check their participation levels.
What was their reason ?
(Do not post exact quote of support answer as it is against forum rules. So just summarize it with your own words.)
It you think that their reason is not valid then you can keep trying.
You can also try to ask for further details about why they think that they are right and you are wrong.
If you have some screenshots other than the outcome (not 100% participation) which helps your case, then you can post them in the in game Support if you haven’t sent them earlier.
I provided screenshots and all. Seems there is a BUG where players can be paired in multiple alliance wars simultaneously. Even though I did the war with the same alliance, the claim it does not matter insisting it is not a bug the game allows it.
So, just a thought, do you and the others in your alliance that were affected merc for titans? Then there’s a good chance you got caught in multiple alliances for wars.