Hi there kmengvik,
I’m sorry you’re hitting difficulties.
I looked at the checkbox options below, and in advance I can say that is out of the question both to “deactivate all other plugins to check for a plugin conflict” and “revert to the Twenty Fourteen default WordPress theme (with other plugins still deactivated) to check for a theme conflict”
OK, so unfortunately in this case I can’t tell why this problem has arisen just by looking at week view on your site (sometimes that’s possible and we can pinpoint the conflict or problem based on a quick inspection, but I’m not seeing any useful clues on this occasion).
Before we go any further, though, can you visit Events → Settings → Display and see if toggling the default template setting between Default Events Template and Default Page Template makes any difference?
If that doesn’t help, then the next logical step would be to run through our standard troubleshooting steps. I do understand your reluctance to do so, especially on a live site, but you can effectively do this on a test installation without touching the live site.
Simply create a fresh WordPress installation in a subdirectory and install only our plugins to start with: does the problem manifest itself then? Assuming it does not, simply begin adding the same stack of plugins and theme as you have on your live site and try to determine which if any are causing the issue.
Would that be possible here? Let me know how you get on!