Duplicate "Set-Cookie" header in response

Hi,

Can you provide more information?

Having multiple set-cookie is not something bad, actually it is often the case.

Do you mean you have multiple set-cookie with the exact same cookie (same name, same domain, same path) and also with the same values? This would be strange 

If it is the exact same cookie but the values are not the same, it would need further analysis because you would have to decide which one to keep, or it would be up to the browser to decide which one to use (generally the last one but I think that this is not guaranteed).