Is this a transition from an inline element to an inline block or block?
using the ie8 developer tools, try changing the element's display:inline-block property to display:inline-block and see if a problem occurs.
edit: reply to comments
what is likely to happen, the element is extracted from the expected stream of documents (it is added to the body or a new parent is inserted, and this is added to it, etc.) and the css rules, which are usually applied, are not in this case.
use firebug to identify all the css rules that apply to this element, and then try adding this id element, #replaceme, to the selector list to ensure that the element becomes stylized as you expect. eg.
dt > dd.def { }
becomes
dt > dd.def, #replaceme { }
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