What is the skills detail card?
If it is the field "Detailed Description" in sheet "Distribution" then I don't undestand why the issue is only on devices without display.
Email from The Alexa Skills Team:
Issues observed on devices without display (Echo, Echo Dot)
The description displayed in the skill’s detail card must contain accurate information so users are well informed on how to use the skill.
Please provide a detailed description on the functionality of the skill for better customer experience.
Please see test case 3.2 from our Submission Checklist for guidance on skill descriptions.