So I was right in the middle of a game of Skirmish while progressing through "The Mountaintop" questline, when it said I completed a quest for Shaxx. After the match I went to Shaxx, finished my quest and got a level 5 uncommon gun, and when I looked for the Mountaintop quest it was gone. I looked in the abandoned quest log and everything but it's as if the quest never existed. Any ideas?