Hi Mads,
We have seen that you are using the old version of the WHMCS template.
We already updated the template on 06 August, 2018 – Version 2.7.
[*] WHMCS template updated to be compatible with the latest “WHMCS Version 7.6.0”
Please download the updated version of this item from the Envato Market (themeforest) and use the updated version of the WHMCS template to get rid of the issue.
Changelog included in “documentation/changelog” (folder).
Best Regards,
ThemeLooks Support Team