Topic: TinyMCE text area is not showing left border in MVC application in IE.

I am currently working on an ASP.NET MVC 5 application and using TinyMCE plugin to display a TextArea. The problem is when I run the application in IE 11 and alter the browser window size, sometimes the left border of the iframe in TinyMCE TextArea does not show. Please check the image - http://i.stack.imgur.com/IIEmb.png. I tried to add custom styles to the iframe but since the issue is inconsistent, the styles would be applied in normal mode as well and the border looks ugly. Unfortunately I could not find much help online, but If anyone has an experience in using TinyMCE plugins any help would be greatly appreciated.