Expanding content in responsive tables don't work

Jaybird

Hi,
I've got a responsive datatable here: https://ehealthresearch.no/en/employees

Works fine on full-size desktop, but on a narrower screen (on mobile or when resizing my browser window on desktop), the datatable resizes as normal, and columns get hidden as usual. The problem is when I click on the green expand (+) symbol, the hidden content won't show, instead I get the email address of the employee in question.

Any thoughts on what could be wrong?