I call this a bug... Is it?

[Wish]

i am confused at what you are saying...

an enemy teleporting task force would land and besiege, your task force would land inside the castle.

a break seiging army would fight before the storm castle took effect, and if they won, the storm wouldn't happen.

what it sounds like is you broke seige, lost, your army routed, the stormers won.... and that would mean the teleporters are routed as well.... unless they are your army beseiging the castle, in which case thats weird.

we need more information or at least to have it worded better.