Internet Explorer 11 enters incorrect Japanese syllables when you focus on an input field with the IME in active mode

This issue occurs when you use JustSystems's ATOK as your input method editor (IME) and set Romaji input mode as the default. Japanese Kana input mode is enabled accidentally when you focus on an input field with the IME in active mode in Internet Explorer 11.

For example, when the IME is in active mode, and you enter the letters k and a in an input field, Internet Explorer incorrectly enters two Japanese hiragana syllables no and ti (“のち”) instead of the expected single Japanese syllable ka ("か").