Unique visitors

I have a question concerning the unique visitors.
We have activated the cookies and we think that the number of visitors is too low.
In our database, there are much more different logins than unique visitors. All of the visitors have activated their cookies.
How could that happen?

What do you mean by “enable the cookies”? can you also show screenshots of your database so we can understand what you mean? thx

i agree with matt… what the meaning of “enable the cookies” ?
is it mean cookies on your host? or your browser?