Booked Tickets does not disappear in Firefox and Chrome

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I have created a calender with 4 eventdays. Every day has 2 Tickets for available times, 8.00h – 2 Tickets, 8.15h – 2 Tickets.
When the two tickets are booked and no longer available, they shoud disappear. That works in Opera and Brave Browser, but not in Firefox, Chrome or Edge.
Any idea or solution?

Info: 8.30 is booked two times and should normally disappear.

  • This topic was modified 1 hour, 53 minutes ago by Ute.

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