There are a few things that could cause the Marketing Center to display incorrectly in your browser. Below are ways to check and fix the most common causes of such problems.
Make sure you use a supported browser.
Make sure your browser is set to the default zoom level (100%).
In most browsers you can do this by holding down the 'Ctrl' key on your keyboard while tapping the "0" (zero) key once. If "Ctrl"+"0" does not work, check the tools and/or settings menu in your browser for zoom settings.
Make sure a browser add-on is not interfering with websites you visit.
See your web browser's help menu for instructions on how to start your browser without add-ons or extensions to discover if an add-on is the cause of the trouble.