heading background image single events

Hello, I use the event calendar and it always worked great. I have now an issue with the heading background image of the events pages. I usually customized the heading background image of each event in the theme options and it worked perfectly. Now this is not working any more.
The single event always display the background header image of the main events page and not the one selected for the specific event.
I think it could be some update of the theme or plugins. Anyone with a similar issue?

The page I need help with: [log in to see the link]


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