Pages not loading correctly in IE 11

Hi, One of our websites is showing 2 pages incorrectly on internet explorer 11 using Windows 8 and I’m not sure why. They appear to work on all other browsers. The pages in question are https://ccss.org.au/volunteer/ and https://ccss.org.au/reports-resources/. Could you please have a look and let me know what the issue may be and how to fix it?