How Depot selected default BILL_TO and SHIP_TO of an account

 Hi,

I have an account which has multiple sites defined under different Operating Unit. The responsibility level profile is set to - US operating unit.

While I select the account not sure on what basis it pulling some BILL_TO and SHIP_TO. The main issue is with SHIP_TO as its showing some other countries address.

The sites coming in Depot are not the identitying sites as well.

I tried in OM and Service Request Forms, both of them as fine and pulling correct records. 

Any Idea what is the logic behind Depot From to pull BILL_TO and SHIP_TO sites?