To expand on this, this usually happens under these circumstances:
1. You updated IE incrementally (that is to version 10 then version 11 when they respectively came out)
2. Your Windows cache still retains the previous IE update.
If both are true, when you uninstall IE11, it will rollback to the last available version of IE (which would be 10 or 9). If there are no previous updates for IE on your system, it will rollback to IE8 (which came with Windows 7 at RTM).