Cant reduce number of columns in quick stack in mobile breakpoint

so I decided to update my website again…
i am happy for all breakpoints after I deleted all breakpoint specific params, but now quick stack won’t let me reduce its columns for the smaller breakpoints.

Any idea why that could be?

thanks in advance.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

I have the same issue. The column value in the style panel is unchangeable at smaller breakpoints for some reason.