See video.
Pretty basic - on an existing site, we created a new section, added two rows to the section. The bottom row we never touched. Top row was set as 2/3 + 1/3 split. Added one element to each column. We went and edited a different element not in this section. Came back to this section and changed the column config in the row to 1/3 + 1/3 +1/3. It did not take. We tried other configs, they did not take. We saved and reloaded the page, the row’s column config will not change not matter what. (??)
Vid: https://co50.com/ThemeCo2.mp4
Page in question uses no custom CSS or javascript.