Hey @mediegruppen,
I tested the Classic Slider in my test site but it displays fine in IE so there could be something in your site that is causing the issue. Would you mind trying the following:
1. Check if something in your child theme is causing the issue. You can do that by switching to the parent theme then check if the issue will persist
2. Check if something in the header is causing the issue. You can do that by switching the page template to Blank - No Container | No Header No Footer
3. If you have custom CSS anywhere in the builders, check if there’s a syntax error.. To quickly check if this is causing the issue, you can temporarily remove your custom CSS.
If the issue persists after testing all those possible solutions, please give us WP admin and FTP access in a Secure Note.
Thanks.