Jobs scheduling problem - Orchestrator

I am facing problem during schedule run.
I have a number of scheduled jobs, in different time frames. Some of the jobs is scheduled for the same time. In case the robot is busy with a job, the following scheduled job was presented in the pending status by Orchestrator, and as soon as the robot becomes available the pending job starts.
I’ve been running it for a few months now and everything worked fine.

For some reason since about two weeks this behavior has changed.
And now the jobs are not pending, Instead the job is Faulted, With error: “foreground process is already running”.

Would appreciate help.