Zsasz mission still on the map in Batman Arkham City

[Lecamwasam]

I finished the Zsasz mission previous night, got the e Dial Z For Murder Trophy , left the building, play about a bit more, got a few riddler puzzles, and gone to bed. But today Got home and saw the side mission still on the map. I hovers over it moreover in no doubt sufficient there was the mission details. So I go back into the safe house but Zsasz was in his little cage plus the hostages we free. I don’t know what wrongs with it can anyone here assist me on this does this happened to anyone else here ?

[Muktheswara]

The same thing happens to me also just occur even though got the achievement, it's still on the map and the major objective, at the same time as he is still in the cage I think it’s a Glitch? How can we get rid of it it will be really nice to know this