Symptoms
This issue occurs on a Windows Store app that uses HTML or JavaScript. Assume that you enter characters in a text field by using Input Method Editor (IME), and then you set the focus on another text field with IME disabled. This issue occurs when you set the focus back to the original text field.
Resolution
To fix this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer. Note This update was first included in the MS16-009: Security update for Internet Explorer: February 9, 2016..
Status
Microsoft has confirmed that this's a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.