Completed Towers not working after Joining party.

I completed a tower on a map. I then joined a party to help someone kill a boss real quick. I left the party and came back to enter a tablet into the completed tower. Inside the tower map it says "Map Complete". On the map table if I click on the tower now it says "map in progress". SO essentially I lost the completed tower. Lesson here is, don't join a party until you put a tablet in the completed tower.