Adding more than one category to the projects pages causes malfunction

[Pedro Henrique Pereira Braga]

Hi! Thank you for this theme! We have been enjoying it!

We have observed that adding more than one category to the category tag within the project section makes the category subsetting system break.

When a single project content file contains more than one element (added as ["category_1", "category_2"]), selecting one category results in an empty subset.

See an example (here)[https://qcbsrworkshops.github.io/symposium/], where multiple categories have been attributed to the same page.

For instance, the "Open Science and Reproducibility in R" page has category: ["Reproducibility", "Open science", "Github", "Markdown"]. Selecting any of these tags does not highlight the desired page.

Could you please let me know whether there is something related to the tags that we are missing from our side?