I have not yet completed the map for Omen Islands, yet while on a quest I was seeking an item sold at the Inn and ended up in Rathskeller Inn. Thinking I was in a different food shop I bought the quest item along with two other items before realizing the glitch. Not really sure what I should do with the two items I still have (Crab and Clams) or if anyone else has experienced this glitch, but I'm fairly sure I shouldn't have access to this shop.

We can still access Rathskeller even if we don't have the map yet.