Good morning Marko and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the plugins not playing together nicely on your site. Yikes!
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Secondly, could you please send me a copy of the latest version of your WordPress theme / child theme via a link to a .zip file link (stored Dropbox or Google Drive) so that I can run some tests on my end ? I recommend a private reply for that purpose.
Please ensure you are using the latest files as found on your actual website.
This way I will get access to any updates or customizations you might have made.
Finally, I already have a copy of WooCommerce subscriptions, but could you include a copy of WooCommerce memberships in your .zip file so that I can replicate your installation on my end ?
Hang in there!
Geoff B.