Graphic error on location from altimetry

During a bike ride
http://www.gpsies.com/map.do?fileId=sqtqtighyvwatruj
I noticed that oruxmaps on the trip computer in follow mode the current position by green dot was in a completely wrong place: at the start of my trip Oruxmaps marked the green dot at the end of the track, after another few kilometers the dot disappeared and I never saw it until the end of trip!
Actualy it's unusable.
You can also put a colored area over the track already make ? I think it's more readable ...