STEPS TO REPRODUCE:
Test environment: Strategy 941 Hotfix 7, Microsoft Office 2013


CAUSE:
A possible cause is that the preference in export options in Web is set as "Excel XP/2003", as following:

ACTION:
Change the export options from "Excel XP/2003" to "Excel 2007 or newer" and export again, user will see correct color in exported excel file, as following:
