Glitch - Two versions of same event after changing the start time!

This is peculiar - my event had the wrong time (7.30) so I edited it to 7.00 - there is only one event in my dashboard but when I search on I can see two versions of the event and both allow me to order tickets. See screenshot.
I need to fix - and have tried deleting the event and starting again but the glitch persists. Can anyone help?