When attempting to insert a raw html element with classes of modal-body or modal-footer using the Swift Page Builder, the new raw html element, although operating as it is programmed, overwrites every other element located on the same page. Good thing for backups.
Oddly, using a class of modal-header in a raw html element works fine and I found a workaround for my needs of using a text box instead and pasting into the code in. In this way, modal-body and modal-footer both function fine and do not cause any issues with the Swift Page Builder or any other elements on the page.