Filter not visible on mobile

Hi,

The WOOF product filter is showing on desktop, but not on mobile devices. If followed the instruction from the topic below, but that did not solve the problem:

https://www.ads-software.com/support/topic/filters-not-appearing-on-mobile/

Am I doing something wrong, or is this a compatibility issue with my theme perhaps?

The page I need help with: [log in to see the link]