The product categories render the header which is assigned for products. At this moment you need to add some code in the child theme to show the global header in Product categories.
You can also take a look at following tutorial for some help. Please note that the article explains the concepts using Search page but the fundamentals remains the same and that you will have to change conditional tags.
Here is a documentation of woocommerce Conditional tags
Please note that we do not provide support for custom development even if you use our theme’s hooks because we’d be working on your customizations if we do that and we only offer that service for our Elite customers. If you want us to customize your site, you might want to subscribe to our Elite service here https://theme.co/elite.