Change of flight mode to Loiter from Auto flight on 'Land' waypoint

Had an odd one today. Flying an auto mission and during the ‘return to launch’ command in the mission the aircraft returned over the landing point and rather than land it went into loiter. Any ideas what caused this? Here is a log and here is the mission. I had flown the mission previously and subsequently without issue. A message does apperar at the point of going to loiter saying ‘land cancelled by pilot’ but as far as I am aware I didn’t change anything or touch a stick. The mission was flown a total of 7 times this day and the problem occured on 2 occassions. Exact same mission in all cases.