Interesting, the height of the image is set to “0” for some reason.
Looking at the code I see no reason for this.
Can you try #1 on this page?: https://generatepress.com/knowledgebase/debugging/
As for your child theme, nothing should be taken from the parent theme and put into your child theme. It should only contain your custom code.
Here’s a blank child theme for you to start with: https://generatepress.com/forums/topic/how-to-install-a-child-theme/#post-198913