Incredibly irritating custom map pool bug in multiplayer

I've found a strange bug that causes only the map Coastal to be selected. I have been using custom map pool with some maps chosen, none of which are coastal, but inevitably upon starting the game I will get Coastal. It seems that after going into the map selection screen and hitting apply it will work as intended for one game, then go right back to only Coastal. Anyone else having this issue or can replicate it?