I've noticed that both the 'Infested Mines DLC' and the 'Skulls for the Skulls Throne DLC' only show up in the listed DLC section of Steam as either blank or a white square. My reason for concern is if the DLC has been installed correctly, I have verified the files - uninstalled and re-installed the game and unselected the DLC and restarted Steam, but nothing seems to make it display correctly.

Can you guys help please?