hmm sounds like some how a script added some topics a few times that. Since you are just starting to customize you could delete all those topics and recreate a new one with this sql script.
Code:
DELETE FROM [dbo].[Topic] WHERE Name='Mobile.GlobalHeader'
DELETE FROM [dbo].[Topic] WHERE Name='Mobile.globalHeader'
DELETE FROM [dbo].[Topic] WHERE Name='Mobile.GlobalFooter'
DELETE FROM [dbo].[Topic] WHERE Name='Mobile.9HomeTopIntro'
INSERT [dbo].Topic(Name, HTMLOK, ShowInSiteMap,Title, Description) values('Mobile.GlobalHeader', 1, 0, 'Mobile.GlobalHeader', '');
INSERT [dbo].Topic(Name, HTMLOK, ShowInSiteMap,Title, Description) values('Mobile.GlobalFooter', 1, 0, 'Mobile.GlobalFooter', '(!XmlPackage name="mobile.footer"!)');
INSERT [dbo].Topic(Name, HTMLOK, ShowInSiteMap,Title, Description) values('Mobile.9HomeTopIntro', 1, 0, 'Mobile.9HomeTopIntro', '(!XmlPackage name="mobile.entitylist" entityname="section"!)<ul data-role="listview"><li class="group" data-role="list-divider"></li><li><a href="e-mobile.entitylist.aspx?entityname=category" class="fullwidth">Shop (!AppConfig name="StoreName"!)</a></li></ul>');