My iframe embed block code is removing the navigation bar and all other blocks after it from my page

Site URL: https://skithefifty.com

This iframe code <iframe src="https://www.bivy.com/adventures/us/utah/cold-fusion-couloir-5286725048860672?framed=true" style="width:100%;height:500px”/>  in both embed and code blocks causes the site navigation bar to not appear on the site page ( on desktop and eliminates the nav hamburger on mobile) and causes any other blocks on the page below it not to appear. The block with the code does appear.

Page with iframe block problems:  https://skithefifty.com/cold-fusion

Similar page with no iframe block and no problems:  https://skithefifty.com/grand-teton

Any suggestions on what the issue is?