Hello,
Not sure if it is a bug or just a "balance problem" but i just finished the quest to become a vassal of Doran Martell and as expected, my reputation with Dorne increased (from 0 to 12), decreased with the stormlands from 36 to 0 and, more unexpected, with the nightwatch it increased from 3 to 100...
I don't really understand why so much ?
I'm using the last beta 9.5 on moddb, I use the "classic got" war system in the mod, i'm around day 40 and Dorne has no outstanding issue with any other faction.