Please post a screenshot for one of the requests details window.
Did they start exactly at 10:30?
It is scheduled job. It is starting everyday at 10:00 AM. But yesterday it started 30 minutes delay.
Please check the incompatibility of this request.
It might be get delayed since one of its incompatible request which may be running at that time.
Also, another possible reason might be concurrent manager on which this request has been assigned, which might be running on full strength(total number of processes occupied).