iPad mail keeps loading older and older messages

I have got an iPad 2 and set up Gmail. Every time I open mail on my iPad, it keeps loading older and older messages. But I have set iPad Mail to 'delete from server when removed from inbox'.To prevent getting old mail, login Gmail via a web browser on your computer. Click Settings > Forwarding and POP, and then select "Enable POP only for mail that arrives from now on." under "POP Download".If