Taxonomy Filter does not work in preview mode

Hello everyone,

Much appreciated if you can help resolve this problem.

I created a Loop Grid and added a Taxonomy Filter on a new webpage which is in draft mode.

I wanted to filter the loop items by selecting categories set up in the Taxonomy Filter.

When I clicked the category added on the webpage, the related loop items were filtered out on the webpage in draft mode.

However, when I previewed the webpage, the filtering function did not work, that is, even though I selected a category, the webpage displayed all the loop items.

The attached are the screenshots concerned.

Can anyone help resolve this problem?

Thanks!!