How are unique visitors counted?

[holgersindbaek]

I just started setting identity on users before tracking any events:

window.op("identify", { profileId: cookie });

After I did it, the unique users in the dashboard doubled and I'm not sure why. When I look at the events tab, I can see that the events use the new profileId, so it doesn't like it's being counted twice. Any idea of what might be going on here?

[lindesvard]

Unique users are counted based on unique profile_id (this is the same as a device_id when not provided).

Depending if you have path filter it might look in sessions or events table.

But something does not sound right here. Do you have any filters or just the default overview?