Autofill Email not Accurate

Autofill Email not Accurate

Hello, 

I have uploaded all my contacts to Zoho Desk. When I go to reply to a ticket i will often use the autofill feature. 

The issue is it is not taking what i am typing but rather showing autofill options for my recent contacts. for example if i type in "Joe" it will not show all contacts that contain "joe" but rather the last 5 recipients of my email. Even if i type out the full email it will not show it as an autofill option. 

I have checked that these contacts are uploaded correctly several times.