Hi Manuel,
Thanks so much for reaching out!
As a first troubleshooting step, can you try flushing your permalinks by going to Settings < Permalinks and Save Changes. You will want to clear your browser and site cache as well after doing this.
If that doesn’t help, I’d recommend taking a look at your stylesheets and page templates and see if altering these settings helps you to achieve the results that you are looking for:
https://theeventscalendar.com/knowledgebase/stylesheets-and-page-templates/
Let me know how that goes!
Thanks,
Jaime