I’m sorry but as you are using a commercial theme, you need to seek support from the theme’s vendors.
Can you post the contents of your child theme’s stylesheet here? Just the import and comments.
Will follow esmi’s protocol. Thought this might be a more general, theme-independent problem. For @ Andrew Bartel:
/*
Theme Name: Vertical Theme Child
Description: Child theme for Vertical Theme
Version: 1.0
Template: verticaltheme
*/
@import url("../verticaltheme/style.css");
Should have worked fine, I’d ask them if there’s anything weird they’re doing.