Webflow crashes when trying to modify the quickstack grid


I’d be extremely grateful if someone would help me here.

I am trying to build a QuickStack grid for one of my pages. Everything was going smoothly until I started making it responsive. I can’t change the column count on mobile (well, nor anywhere else, it just crashes), can’t merge columns as well.

Read-Only link: Webflow - g. Visual Solutions

Here is my site Read-Only: [LINK][1]