As per the associated post, we too are finding this issue, and means we cannot publish our events accurately.
Will it instead work if we delete the event, republish it, and then modify the date afterward?
Currently we published it with the ticket information set at the same time, and got the buggy effect. Editing again does not fix.
According to the previous original post, they inferred that they could indeed publish first, and then edit afterward?
cheers
Darryl (for Michele).
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PLEASE LEAVE FOR SUPPORT
Reporting the same issue as: https://theeventscalendar.com/support/forums/topic/woocommerce-ticket-start-sale-date-and-time-not-saving-as-expected/