Hello Dan,
I have logged in and re uploaded your Pro theme. I cleared the cache in WP Rocket and purge the cache in SG Optimizer as well. Please check Cornerstone now. If still not working, please clear your browser cache as well. Better yet, use the private browsing mode or Incognito mode and test your site again.
By the way, I have noticed that you inserted a custom font. It will not work because you did not place the correct path of the font file. You will have to update it and use this instead:
@font-face {font-family: 'RockwellMT';src: url('https://flexcin.com/webfonts/307CD4_0_0.eot');src: url('https://flexcin.com/webfonts/307CD4_0_0.eot?#iefix') format('embedded-opentype'),url('https://flexcin.com/webfonts/307CD4_0_0.woff2') format('woff2'),url('https://flexcin.com/webfonts/307CD4_0_0.woff') format('woff'),url('https://flexcin.com/webfonts/307CD4_0_0.ttf') format('truetype');}
@font-face {font-family: 'Populaire';src: url('https://flexcin.com/webfonts/307CD4_1_0.eot');src: url('https://flexcin.com/webfonts/307CD4_1_0.eot?#iefix') format('embedded-opentype'),url('https://flexcin.com/webfonts/307CD4_1_0.woff2') format('woff2'),url('https://flexcin.com/webfonts/307CD4_1_0.woff') format('woff'),url('https://flexcin.com/webfonts/307CD4_1_0.ttf') format('truetype');}
@font-face {font-family: 'PopulaireLight';src: url('https://flexcin.com/webfonts/307CD4_2_0.eot');src: url('https://flexcin.com/webfonts/307CD4_2_0.eot?#iefix') format('embedded-opentype'),url('https://flexcin.com/webfonts/307CD4_2_0.woff2') format('woff2'),url('https://flexcin.com/webfonts/307CD4_2_0.woff') format('woff'),url('https://flexcin.com/webfonts/307CD4_2_0.ttf') format('truetype');}
We would loved to know if this has work for you. Thank you.