When trying to change the shields on the main longship, it instead applies the shields that are on the river raiding longship.
For example; if the river raid longship is using the Jomsviking shields, and the main longship is using Hearthweru, the visual on the main longship is of Jomsviking shields rather than Hearthweru shields. This graphical error occurs no matter what shields are being used on either ship; the raid longship shields always overwrite the main longship shields.
Playing on Xbox One. Have reloaded the game and error persists.