Hi there,
First of all you should take a look at our documentation since this is just a css issue:
www.hikashop.com/fr/support/documentation/faq.html#css
Second, I actually think the issue come from your QR code. Just use the inspect element feature of your browser on this element and try to set some css rules.
Once you found the right one, just add it to the Hikashop front end css file (In System>Configuration>Display>Css).
Ps: I think something like float:left; should work. But if you can't find, give us a link to your page