Hi @CathyPoppenwimer -- I tested this by embedding your Experience in a plain web page and I see the same behavior, so this does not seem like an issue caused by the StoryMap. The Experience appears to be stealing focus of the entire web page for some reason. I have seen this before, but I'm not sure of the reason or if there is a workaround.
Here's the test I created and when you load the page you can see the same behavior you described where the page jumps down to the embedded Experience. Embedded EXB in plain web page (codepen.io)
I'm moving this post to the EXB questions board in hopes that someone there can help.
Owen Evans
Lead Product Engineer | StoryMaps