If you have overridden the visual force tab, then you cannot see that changes in salesforce1.
Please consider this point given in above link.
Standard tabs, custom object tabs, and list views that are overridden with a Visualforce page aren’t supported in Salesforce1. The Visualforce page is shown for full site users, but Salesforce1 users will see the default Salesforce1 page for the object instead. This restriction exists to maintain the Salesforce1 experience for objects.
Please refer below link which has all information.
http://docs.releasenotes.salesforce.com/en-us/winter14/release-notes/customize_sf1_visualforce.htm
Please let us know if this helps you!
Thanks and Regards
Sandhya
Thakns for your reply.
I have tested everything and the settings are looks good.
Do you have idea why we this is the issue happening?
Please consider this point given in above link.
Standard tabs, custom object tabs, and list views that are overridden with a Visualforce page aren’t supported in Salesforce1. The Visualforce page is shown for full site users, but Salesforce1 users will see the default Salesforce1 page for the object instead. This restriction exists to maintain the Salesforce1 experience for objects.
Thanks and Regards
Sandhya