Calendar extender popup padding not working

I am having a hard time tracking down this issue where on the right side of the calendar popup extender the padding is not like the left. I have taken a screenshot and included it below. It is happening to all the calendar extendars so I am thinking it is a CSS issue, hopefully.

I have used developer tools in Chrome to try and identify any issues. I am almost 99.9% sure that this is a CSS issues. I have found the class the extender uses and have tried to adjust the CSS but have had no results.

Has anyone seen this type of issue before? I am sure it is something simple. Thanks for the advise.