Hey Molly and Regan,
Not sure if you are still having this issue but the same thing is happening on a site I am working on now. What worked for me was removing all custom CSS code from the design page (if you have any), saving, then editing the section. After making the edits I needed, I added back the custom code and saved again. I also have code injected under the settings page but I did not have to remove that in order for this to work. Until a patch can be pushed live, this has been the easiest workaround for me. No more dragging with the columns getting way too big or deleting the section and adding it back again.
Just be sure to copy and paste any custom code to another text editor before you remove it so you can paste it back after!
Hope this helps,
Nate
