The Iron Citadel completition bug

Hi,

The first time I completed The Iron Citadel my character died and then the boss died. The loot appeared but I was dead. Since then, every time I complete that map I can't complete it. It says there are 0 monsters left and I've checked the map several times and it doesn't show me as completed. If I open another map it shows me as failed and the path is blocked. It only happens to me in The Iron Citadel whenever I try and I think it has to do with the fact that the first time I died a little before the boss and I couldn't get the loot.