All chocolate Cockers have lighter coloured eyes than those with black pigment (blue roans etc) so they will never have really dark brown eyes but should have eyes which are sort of hazel-coloured (if you have a look at a photo of Gilly's Buttons, she is a good example
) Sometimes chocolate/liver Cockers do have eyes which stay greeny/yellowy but at 14 weeks old, your pup has plenty of time for the eyes to darken.