Membership plugin conflict with my Theme and give different lay out in Firefox and IE

Hi,
I have installed the membership plugin for my test site and my theme is ATTITUDE(http://wordpress.org/themes/attitude). Site look perfect on Chrome browser but in firefox and IE layout has changed .Pages created in the membership plugin(Account/Subscription/Welcome/Protected content) will be come automatically to home page widget area.Please advise me how to sort it out this .
My test site url is http://urgentcare.healthlabcrew.com/
appreciate your quick reply,
kind regards,
Dr.Lasantha