Please see the attached screenshot that the home page is getting updated fine for me.
What error are you getting?
Could you please share me the screenshot of the error that you are getting?
Please try using a differnt browser.
Also I can see you are using outdated version of PHP on your site as displayed in the second attached screenshot so please update the PHP to latest version by contacting your webhost.
I could reproduce the error on your site by saving the page multiple times.
Normally, most WordPress hosting companies have their servers configured, so that WordPress users can easily upload large images and other media but in your case this doesn’t seem the case therefore you are getting the error as corporate home page contains large data.
Please contact your web host to increase maximum upload size and execution time.