"Child theme of my weltpixel theme is not responding anymore on the edits and adjustments that we make in the admin. Can you help?"
For cases like this the first thing that needs to be checked are the customizations added to the child theme as it can be a main cause for breaking theme / magento functionality. If the child theme worked ok for some time and suddenly it stopped working you may want to check the code recently added under below file:
A quick test to identify the root cause can be performed by switching the child theme containing customizations with the main theme, in order to bypass customizations added in wp_custom.less.
If the store is working as expected with the main theme but failing to do so with the child theme, most probably this is caused by the code added in wp_custom.less.
Easy debugging for cases like this is to completely remove custom code from wp_custom.less and add it again section by section until you identify the code section that is breaking the theme / magento functionality.
If above doesn't solve the problem, check also:
1. How to configure the theme when using multiple store-views:https://support.weltpixel.com/hc/en-us/articles/115003645074-How-to-use-Pearl-Theme-on-multiple-store-views-Important-update-install-instructions
2. Style not applied after switching to production mode: https://support.weltpixel.com/hc/en-us/articles/115003635593-Pearl-Theme-styles-not-applied-or-design-issues-after-switching-Magento-to-Production-Mode-