BUG: split not always working as expected

I loaded the journey https://cycle.travel/map/journey/980180 and wanted to split it into individual day trips, so I selected save and checked the split checkbox. This gave 6 files. When trying to load these day 1, 4 and 6 load as expected.
However for days 2, 3 and 5 the behavior is different.
The file is loaded but the map does not zoom in onto the track. The map shows the center of the Netherlands while the journey is in Belgium. 
Also those 3 days do not show directions in the editor.
And when in My Journeys it is not possible to load the gpx track for those 3 days.

This is all on PC: Ubuntu/Firefox. In the app the journeys show as expected.