Events SharePoint Online

Hi,

I have a problem with Events in SharePoint Online, The hubsite does not filter events properly (from associated) sites based on category. I have tested this several times and this is the result:

When an event does contain text "about the event" (See screenshot below) then the event is NOT shown in the hubsite but when i remove the text, the event gets shown again in the hubsite. Does anyone know what the problem here is?