Good evening Nanja and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
By the looks of it, one of the following things is probably causing the issue:
- We do not officially offer complete Polylang support yet.
Polylang Pro is known to work well with the Events Calendar.
Some of our customers have even achieved compatibility with other plugins such as Event Tickets and Event Tickets Plus.
Try deactivating Polylang temporarily
- There could be a conflict with your theme or with one of the plugins. Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if that helps.
Let me know how that goes.
Best regards,
Geoff B.