Hi Flo,
Thanks for reaching out to us! I’d be happy to help you 🙂
First of all, could you make sure all your plugins and your theme are up-to-date? Then, did you try to use Events Calendar PRO + Beaver Builder + the default theme (Twenty Seventeen)? If so, does it work that way or not? You may read our documentation about Testing for conflicts to know more about those potential conflicts and how to solve them.
Also, could you share your System Information?
Thanks in advance,
Jeremy