Hi Fabrice,
Thanks for reaching out, and I’m so sorry for the trouble here! I’d be more than glad to troubleshoot this with you to see if we can figure out what’s happening.
It appears as though you do have some plugins installed that could be potentially conflicting with The Events Calendar, so I’d like to try a round of conflict testing first to rule out any issues there. Would you mind taking a few minutes to run through our conflict testing steps as outlined in this guide and report back on your findings?
Thanks, and let us know what you’re able to find out!