Deferring the appointment of a lord causes plunder

[tos1]

When the player as a independent faction sieged and took a castle, a plunder (battle against people in the castle) started though I selected "defer the appointment of a lord" from the choices.

Probably the corresponding lines are:
----
strings.txt:str_sire_my_lady_we_have_taken_s1_s2
{reg59?My lady:Sire}, we have taken {s1}. {s2}
----
str_who_do_you_wish_to_give_it_to
Who do you wish to give it to?
----
dlga_award_fief_to_vassal:award_fief_to_vassal_defer
I wish to defer the appointment of a lord until I take the counsel of my subjects there.
----

The behavior is the same with one when I selected another choice "I want to plunder ...".

- How to reproduce it/when/why it happens:
Don't become any vassal and play as an independent faction. Take aim at a poorly defended castle, siege and take it. After you chose people and things you got, one of companions asks you:
"My xxxx, we have taken yyyy. Who do you wish to give it to?"
Select "I wish to defer the appointment of a lord until I have finished... determining its value.". A battle starts in the castle's ground.

- Game version (and steam or downloaded):
AWoIaF v8.2, Warband v1.174 downloaded