We have 53 Theme Versions. Which Theme are you using and what is the Site URL ?
Did you check the DEMO in different devices ? http://demo.d5creation.com/wp/themes/d5businessline
Did you Activate the Responsive Layout from WP-Admin > Appearance > Business Line Options > General Options ?
If you check The Demo in Google Mobile Friendly Tester you will find Awesome! This page is mobile-friendly. Please Check Here
We also recommend your to Update your site to the Latest Theme Version: https://d5creation.com/themeupdate