Event reposting a new event every hour

I have a Calendar Feed set up which pulls in events every hour from another site. It’s been working really well until yesterday when it started posting the same two post every hour. When I checked these events, they had pulled in the title, event date and the content but not the featured image, or any event details (time, organizer, etc).

I checked the original source events on the site that feeds this site and both events look ok.

So I deleted all events instances on the site as it had been posting every hour there were quite a few. However, both events keep publishing every hour. For some reason they have no category selected and are not visible on the frontend.

What can I do from here to stop the posts every hour? Please note that the event is not posting every hour on the original source site.

Also, the original source site is used to feed another of my sites and this is not happening there so it’s particular to this one site.

https://www.ads-software.com/plugins/all-in-one-event-calendar/