To me it looks like a compass related fly away, starting at 1m29s. see my chart where yaw line are diverting, normal indication are both line equal to each other.
Why an autolanding? mayby because this warning " Your aircraft is at the boundary of an Altitude Zone. Please fly away with caution."
Speed in the log is often incorrect when GPS positions errors are there.
If you like upload the DAT file for this flight, is on the mobile device as well, more info about compass and errors can be found in the dat file.