Responsive issue with latest update

Hi,

The recent update has affected the responsiveness of the gallery.
I have set up the masonry gallery to be in multiple columns for my portfolio in desktop view. Previously, when viewed on mobile devices, the masonry gallery switches to a single column. With the recent update, the masonry gallery remains in multiple columns on mobile view, making the images too small to view. Please advise how I can switch back to single column for mobile view.

Thanks!

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