Background photos not resized in mobile version

I am using Clean Business Pro 2.2.7 on SELCOUSA.com, have removed all other themes but Twenty Seventeen, sixteen and fifteen. The background images do not resize when on mobile. Have tried to disable all plugin's but it changes nothing. Have reinstalled CBP 2.2.7 again, also with no change. The plot thickens for if i enter the background image settings, it shows no images are used. Looking for ideas to source of problem. Used same theme on prop-el.com and don't have the problem there.