Sticky sidebars on scroll => text becomes anti-aliased

Hi everyone,

I used the “Desktop devices : make sidebars sticky on scroll” option on my site.
In Chrome it works beautifully. But in Internet explorer, after scrolling down just enough to activate the sticky sidebars, the content of the sidebars becomes smoothed / anti-aliased.
Has anyone experienced this before, and perhaps knows how to solve it?

Looking forward to your reply!