Random courier display on onepagecheckout module

[JohnPalomo]

Hi there,

Since I upgraded my store to 1.7.8 I found that once you click the cart to checkout the shipping courier that shows one page checkout is random. I have a bydefault courier selected for the spanish terrotory, but sometimes the courier for shipping to the balearic displays as the unique shipping option. Theoretically is config is done to get the peninsula courier as default one, and only display the balearic shipping one once the customer has place a postal code from within the balearic zone. Any idea why this could be happening?