Clicking on comments textarea sends IE8 into compatibility mode

Hi,

On this post and every other post on this site, in IE8, clicking on the textarea to attempt to comment sends the browser into compatibility mode.

Why?

https://www.foodsafetynews.com/2013/05/interview-with-author-ted-conover-on-his-work-as-a-usda-meat-inspector/

https://www.ads-software.com/extend/plugins/disqus-comment-system/