History Tab - explain entries

Content

In the History of an activity a lot of entries with rout updated are shown

29.08.17 11:59    route updated    Final Travel: 0
29.08.17 12:23    route updated    Final Travel: 86
29.08.17 15:01    route updated    Final Travel: 80
29.08.17 15:02    route updated    Final Travel: 86
29.08.17 15:58    route updated    Final Travel: 0

Which actions trigger these entries for an activity ?

e.g. in a short time frame the travel time is amended :
29.08.17 15:01    route updated    Final Travel: 80
29.08.17 15:02    route updated    Final Travel: 86

Can this be explained?

thx

Claus

Version

OFS 17.2