In my six years experience using Confluence and advising Users of our Confluence instance world-wide, it is not likely to be a Confluence problem, but an IE problem.
I have seen IE do all sorts of weird things with wiki tools as IE is apparently not fully HTML5 compatible. I have seen where IE refuses to copy text onto a page which turned out to be a known IE bug. There is no consistency in that either - seems to be randomly dependant on Windows platform and version and IE version.
We tell all our Users to install Firefox or Chrome for advanced wiki systems like Confluence, if necessary as a second browser for some company IT policies to use IE in preference (I run all four browsers on my PC).
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