Factory girl create list count not right

I use FactoryGril created two users, both with 3 events:

    let (:user) {FactoryGirl.create :user,:with_events}
    let (:user1) {FactoryGirl.create :user,:with_events}

But i get all events count 6, but i got 3,

Failure/Error: expect(json["events"].count).to eq 6

       expected: 6
            got: 3

       (compared using ==)

Thanks!