@Wouter_D 

Hi,
You can try to uninstall the 'ip camera viewer' app on your PC, reinstall it, remove the camera from the 'ip camera viewer' app and re-add it, then check if the camera will display properly on the 'ip camera viewer' app and our Tapo app.
Best Regards

  @Wouter_D 

Hi, 
Do you have the same issue when watching the camera on your PC with iSpy or VLC app?
Can you send us a video showing the reported issue?

You can upload the video to your cloud server(such as Google Drive), generate a link to download it and send me(@Solla-topee) the link via a private message.

Best Regards