Columns suddenly doubled, content pushed to the left

Hi. One page on my website suddenly got doubled columns. The content moved to the left, as if another column was mysteriously added to the right. Those that had one column originally have 2 columns now, and those that had 2 columns originally now have 4 columns, and everything shifted to the left side of the page.

Hence, the page looks weird.

I did not change anything on the page previously. This just happened. I did not set custom column widths.

When I corrected the one particular column, it kept doubling, I’m stuck with the problem on that page.

It’s the biggest page on my website and it would take me hours to recreate an entirely new page.

Please advise.