I´m trying to use that to run an Artist Portfolio website, and looking at your DEMO, looks perfect.
I installed the module, and at first look seemed to be working perfectly.
However, when I assigned more categories, from the fourth or fifth, he began to "hide" the content of some categories.
I created a mirror of the website, where you can observe the behaviors.
The first link - http://novo2018.brunobig.com/portfolio, has all categories assigned, as it should be. And in it you can see that some categories like Painel Rua2 appear as if they did not have any items.
Thank you for feedback us
I think it is only a matter of limiting the number of posts at the first load, you can increase the number of posts larger than the first load, you will see the filter category does not have any problems.
I will check it for you soon
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