Category filter not working in overlay

[albrecht]

please see the problem here:
https://ag-office.com/

if you click on "work" in the navigation, an overlay open with my projectoverview, but when I choose one category from the filter nothing happens.

the problem don’t appear if you go direct to the link (https://ag-office.com/work) and then click on one of the filter.

[albrecht]

EDIT: Tags are working (I’ve deactivated it them again ... but they worked nicely)

[Laytheme is up to date, also tried the category function without any custome code. still not working]