I don't have the lineage for certain of my process which succeeded.
But I did have the lineage for the same process earlier this week :
I didn't manage to find an explanation for this.
@Arthur GREVIN This has been documented as an issue and will be resolved in the upcoming major June release.
See this: https://community.hortonworks.com/questions/24135/falcon-ui-issues.html#answer-24789 for further info.