I deleted the Cache on your site, and i can no longer see the request for the gpsites server in the developers network tools. Test again and let me know.
On the Front Page, you have 3 parent Container Blocks, the 2nd Container Block ( that begins with this “Enjoy carefree days in our top equipped…” ) – select that Container and go to Backgrounds and check to Background Image URL is empty.
If it is empty, or after emptying, publish the changes.
Then in Settings > GenerateBlocks, click the Regenerate CSS button.