Blocking resources with defer attribute

Hi all!
Today I ran a web page test in mobile device and I see 2 blocking resources in my site, but they have defer attribute
Web page test URL: newhomesource.com :...e City, Utah - GCE - WebPageTest Details
Site URL: Rancho Desierto Bello in El Paso, TX | New Homes by Desert View Homes

I want to know if it is a issue from web page test or I really have blocking resource in my site.

Thanks in advance.