Are other users/testers of 10.1 experiencing this?
I have used APM10 with IE11 and dint face any issue with browser rendering.
But as per their documentation, "Compatibility View" settings might effect the view.
Try changing it and see if it helps. MEanwhile I ill try to find out any system with IE9 to make sure resources are same to make a comparison with yours.
So my initial example didn't have compatibility mode enabled, and it doesn't look like IE9 compatibility mode helped
APM 10.1 does not support IE9 regardless of mode. IE9 has too many issues with it's HTML 5 support and Microsoft has announced as of Jan 12, 2016 IE9 will only be supported on Windows Vista. This decision by Microsoft has allowed CA APM to start using HTML5 features starting in APM 10.1 that are not available in IE9.
Ohh.. I dint notice that it is 10.1 and not 10.0
My Bad !!
Anyways, suggestion to CA Documentation team, please remove IE9 as compatible browser from their documentation - compatibility guide 10.1.