advice for web developper: avoid false clickjacking alert

[m.e.]

i'm working on a website for a german bookstore. in order to use the central register of books as a shop, you have to integrate that in your site as a frame or iframe - i'm using an iframe. the original site is a bit oversized, so i 'crop' 21px unnecessary whitespace on the right of the iframe by defining a width and setting overflow to be hidden. the 'cropped' area does optically not contain anything but plain white, so i wonder why the mentioned screenshot comparison fires a clickjacking fraud warning. is there any way besides having to live with ugly horizontal scrollbars to prevent noscript from doing so?

[Giorgio Maone]

is there any way besides having to live with ugly horizontal scrollbars to prevent noscript from doing so?

Yes: living with 21px of unnecessary whitespace being shown, or asking the framed site (which the 21px belong to) to remove them.