When you click on a link on a webpage that sends you to another site, that link can be modified to have the previous webpage as the referrer.
Some of pixiv's webpages use referrers for displaying on the site.
It's possible that some of pixiv's referrers may not work as intended depending on your browser settings, your plugins, your addons, etc. Please check to see if temporarily disabling your plugins and addons fixes your display issue.
Additionally, it's also possible that the settings of your antivirus program or other security software may be interfering with the referrers. Please try changing the referrer permissions. (For information on how to do this, contact the software company directly.)