The path of Warriors quest glitch?

[boeriemore]

I was supposed to climb to the top of the mountain then swim in the caverns to complete this quest. About halfway up the mountain I saw that the instruction on the screen said to go to the caves which I did. After completing this I had to leave the caverns and return to the quest giver who complemented me on completing it. I later watched a video and discovered that I had a long way to go still to the mountain top yet the quest completed without me doing so.