Hey Ilija,
Thank you for reaching out to us!
I’ve accessed your site and could replicate the issue you are experiencing.
Can you please make sure that both The Events Calendar (TEC) and Events Calendar Pro (ECP) are up to date? (TEC version 4.5.9 and ECP version 4.4.15).
Also, can you please access your Dashboard and head over to Settings > Permalinks for a permalink flush? (no need to change anything, just visit the permalinks page: WordPress will automatically trigger the Permalink flush once you access that page).
If the issue persists after following these steps, please share your system information with us so we can further investigate your case.
Regards,
Patricia