Hello,
I have logged into your website and it seems that there is no shop page on your website that’s why the categories banner is not working for the categories. Actually the shop and categories pages are controlled by WooCommerce and our theme doesn’t influence this.
It seems that you have set both the front page and the shop page the same as why it’s behaving like that. Please make separate page for the shop page and then check back this will fix the issue. Because the pages used as the front page cannot display the titles this is default WordPress functionality.
Best Regards.