I have Arduplane 2.73 on a plane I'm working on and it flies a mission quite well right until it reaches loiter altitude in home. Upon reaching home, it does a descending turn as expected until it reaches default altitude. Although, after it reaches default altitude over home, it suddenly throttles up, flies away from the loiter pattern, and maxes out its airspeed limit. This has happened repeatedly over different waypoint files.
I've attached the log file and the action happens at the 77% mark. I hope anyone can give an insight as to what the autopilot was trying to do. I would very much appreciate it :)