Fortress of Resistance bug

as usually, we went to fortress of resistance event where you have to kill nurka in order to get this clan hall.

this time we didn't get the clan hall at 23.10 h gmt+1 as the clan hall rules say. we were the first clan killing the raid boss and our clan leader (me) made sure to say that we want to be the owner of the fortress of resistance.

we have been doing this for around 6 months and it is the first time the system doesnt give us the clan hall after 10 minutes passed from the time dead line of this event.