Happy path showin 0 cases

Dear community,
I have created my own eventlog from sap (field names are the same as in celonis eventlogs) and imported it to default analysis. I do not have problems with process explorer nor with process variants.
However when I open Process Overview I can see some happy path but with 0 cases:

Througput times and activities are displayed correctly. What could be possible cause for this strange behavior.

Ula Jessen