I’m adding 2 more screen captures for you to look at. This is a bigger issue than just duplicating a button.
The first video I go back to that locations page and manually add another button and it breaks at that button again. I then add a text element in one of the columns near the top of the page, it does fine. So I add another row to the bottom of the page, add a text element into each column of that new row and the page breaks at that spot again showing shortcodes again.
The second video I make a new page, create a new section, row 1 is 1 column has a headline in it, row 2 is 4 columns and I put 2 images and 1 text element in each one. I then duplicate the section a bunch of times eventually breaking it, with no buttons being used at all.
This may be an issue with the duplication feature overall. I’m going to rebuild the locations page for my client 1 element at a time all the way through and screen cast it as well. If it too breaks, I’ll post it for you as well.