Vassals glitching during the Conquest

Hi, following the new version I decided to start a new game with Aegon and do the Conquest. So I declared war to Harren the Black via the event but nothing happened, just the northern Crownlands submitting and Darklyns in rebellion. When I defeated them the lord keep the hugh lordship but all of the vassals were now directly sworn to me. Then I declered dragon conquest to the Iron Island, defeated them, doing this with every kingdoms and giving the Stormlands to Orys. The results are : Baratheon in the Stormlands with the kingdom title but ruling only over the high lordship of Storm's End ; every other great families ruling over only the capital (and some castles like Moat Cailin and Ghaston Grey) and still being Lord/Lady Paramount ; the Riverlands and the Iron Islands, since I created the first and "usuped" the last, were complete (all the vassals sworn to the capital). At first I thought this was because of submods, so I disabled them but nothing change.

What should I do ? And also am I the only one who have this glitch ?