Stack Image Grid Displaying Incorrectly on Mobile

Site URL: http://ironworksithaca.com/all-floor-plans

Hello,

I hoping to find a solution for how our Stack image grid displays on mobile. On the desktop version, the floor plans are organized horizontally in alphanumerical order (which is preferred), however on mobile, they display vertically and are out of order. Is there something that can be done to fix this?

Thank you in advance!