I have some problems in desembark into Dragonstone:
1. Some units stuck in front the ship
2. Reinforcement ships cant desembark because the ships are so big and the coast is small (they stuck with first ships)
3. Some units return to ship and stopped to receive orders
Im using battle size 300.
Is there some workaround?
Some maritime sieges aren't working properly, try looking on the wikia for the manual controls during naval warfare, if that doesn't work you have to resign yourself to doing the landed siege instead.