When rerendering regions with multiple child elements, IE11 breaks the DOM by nesting the former siblings.
I tried changing sarrissa as described in this issue: https://issues.jboss.org/browse/RF-13443
But it does not seem related or helping.
This stackoverflow question describes the issue perfectly:
Here is a screenshot where this problem leads to multiple pagination controls, as the old dom elements reside instead of being replaced when rerendering: https://dl.dropboxusercontent.com/u/18449425/permanent/richfaces%20ie11%20a4j%20rerender.png