responsive styling Upfront

Hi there. Page for reference: steingardstudios.com/home

Hope you are having a good day. Me I am stuck on something. My responsive styling looks good in theUpfront editor for this site but when I visit in on my iPhone 5s it loads like the attached image with 33% white space to the right of the page.

I noticed it looks like it loads the page at almost 100% and then once the page loads it jumps down to the attached size. Any thoughts? Thanks so much for your help.