Thanks for looking into this! I had several very odd cases with arrow sending all over the place just to get back to where I am currently standing.
I am now trying to find out which addon(s) are causing DG arrow to get confused ever so often. With the other cases I already tried disabling addons, but now I will specifically test this with Kadrak again, because it was easily reproducible the last time.
You do need to refresh the waypoint (click again) when you walk beneath or onto the tower, though. Will report back once I am through my addons.
Btw, step 52 and step 53 are the same, both telling me to turn in a finished quest with Kadrak.