Hi,
It comes from your template.
When it works it uses the CSS:
.system-transparent.isblog #system .item, .system-transparent.noblog #content {
color: #fff;
box-shadow: 0 0 1px rgba(255,255,255,0.2);
}
And with your error it uses
.isblog #system .item, .noblog #content {
padding: 20px;
background: #fff;
}
which means that the class "system-transparent" is not set the body.
But HikaShop does not have any link with this body classes (as the CSS file which is "yoo_subway/css/system-all.css")
Please check your template configuration.
Regards,