Device event error with latest update

Upgraded to last night. This morning I looked at the events list on the device page and noticed what looks like an incorrect entry. (on at 10:15 not 10:00).

See clips attached. This is a simple Rule 4 rule which has been very reliable. It is simple and so I don't know where the problem came in. I really think it came on at 10:00 am, and the device event list is somehow reporting an incorrect time.

Very strange indeed. Seems to have cured itself. See attached event log. Back to normal 10am to 11:30 am cycle.