Hi.
I have checked and fixed the isotope issue on your site.
For the category content display, because you have a lot of articles in the first category, that is why other categories can't display.
You can change the post order or increase the article display on the first load option.
Regards.
Isotope layout will auto load. We have installed the latest version of the module on your site to fix the isotope issue.
To see your categories article, please check the "Count Items First" option:
prnt.sc/F8vLU5NEPhMN
Regards.
Which number articles need to display on the first time? If the user want more, they can use the load more.Which number articles need to display on the first time? If the user wants more, they can use the load more.
Regards.