Hey @lizmcmillen,
It’s natural for the image to be blown up because you’re covering 2 rows (row with text element full of nbsp; and row with contact form) in a section. In addition to that, you’re using the background-attachment:fixed CSS to create the parallax effect. This alone blows up the image in Safari 13.
Maybe try removing the background-attachment CSS and use the Background Parallax option.

Also, I’d recommending hiding the Text element in Small screens and replace it instead with an Image element showing your background with the Row spanning fullwidth so it covers the section.
Please also note that we do not support parallax on mobile.
Thanks.