After upoad from Zumo 590: Tracklog "current(1) is not identical with the single tracklogs.

[Axel Zuleeg]

When uploading from my Zumo 590 a tracklog it brings a file "current(1)". This file is not identical with the single tracklogs and it is also not identical to the route file. What track is this "current (1)"? The current(1)-file also shows no date and time in opposite to the partial tracklogs. Thanks for any answer.