I found a bug when i was recruiting Banners in the state on Siberia, when i click the button to Raise Banners i got one, then when i cancel the state status of the Siberia área and make it againt one state i got the Raise banner option again and from that point indefinitely, yes i can only have 1 banner from that rpovince but when i raise more and more the other ones becomes regular troops but "free".