DBACockpit Scheduling Failed but Job Finished

Folks,

I'm having some unusual activity on the DBA Cockpit. Each hour I have 4 jobs running (15 minutely trans log backups), and on the whole they work fine. However, randomly, I get scheduling failures.

A successful run looks like...

Whereas a failure looks like this...

with the next job being....

The backup gets done, but I get the Scheduling failure and the subsequent success tab. In some ways it's not an issue as the backup is running, but I'm confused as to why it's happening.

Any ideas?

Thanks

Mike