I am just fixed. The checkout page was not secure https. I enable https and now working fine.
The only problem now not changing icon at webpage tub . Where I can change icon on tab of the page ? I did on “Design Settings” but it not changing
Browsers cache the icon strongly. Try restarting your browser or using anther browser to check.
You may also need to change icons under the “Favicon” tab in the Theme editor module.