Getting the correct number of github contributors via the API

I am trying to fetch the contributors for the bitcoin repository via the api.

When I use GET /repos/:owner/:repo/contributors I get 362 elements back

I assumed that there might be anonimous contributors so used ?anon=1 and then got 860.

But I can’t seem be abel to get the number listed on the repository page – 699 contrubutors.

What I am doing wrong?