We run into this from time to time with certain merchants. It all comes down to how you've customized your print templates vs. the admin styling. Print templates use the admin print styling as their base styling. So, if you haven't specifically defined styles in your templates they will take on the standard admin print styles. The solution is to add styling in your templates that override the standard styling.

I worked out a solution.

Replace the entire contents of the admin print stylesheet (/bvadmin/stylesprint.css) with this:

body, div, dl, dt, dd, ul, ol, li, pre, form, p, blockquote, th, td {
font-size: 12px;
}
h1, h2, h3, h4, h5, h6 {
font-size: 14px;
}
body.print {
background-color:#FFFFFF;
margin: 0px;
}

.creditcardnumber {display:none;}
.printwindow {overflow:visible;border:none;padding:0;}
.printhidden {display:none;}
.print-full-width {width:100%!important;}
table td,
table th {}

.f-row {width:auto;}

/*overwrite Foundation css so Chrome prints page-breaks*/
.column, .columns {float:none;}