See http://www.gps-sport.net/trainings/mountainbiking_290072
This is the exported CVS data at the point it all went wrong... When it happen I took a break I guess(speed 0) and the distance jumped from 18243.13269 meter to 35960.14201
When I look at the track on a google earth it seems fine and I don't see anything else wrong with the CSV log.
ADMIN, can you correct my training so the log shows right on my site?
Also, Can I support you with more info to find the problem?