I have checked both flights and for the first flight it seems to me
that the flight recorder was turned on too late. Every GPS needs some
time to find correct position and when the GPS is moving this time is
even longer. The correct procedure is to turn on the GPS few minutes
before the flight so that GPS could correctly find first position and
will start recording correctly. These jumps could be easily detected
and the recording would be cut off.

In second case the altitude is continuous but with big changes.
Changing the position could have effect. Usually GPS antenna for
flight computer is positioned on perfect spot. Better spot for
flyWithCE Flight Recorder will also result in better results.

Best regards

Uros
www.flywithce.com