Thank you for reaching out to us!
As I can see from here you have an expired license for Events Calendar PRO. The permalink logic for recurring events was moved from The Events Calendar to Events Calendar PRO on version 4.4.14, so it could be the cause of the issue you are experiencing. You can renew your license and download the latest version here.
After updating the plugin, 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 flush your permalinks once you visit it). Be sure to clear your site cache and browser cache after this change.