Ghosts in the Machine

For the past month, I am seeing users come and go with no record in SlimStats. My site requires a login to purchase and so I am seeing orders, and at time contact requests from our form. Analytics will show them as well – but obviously does not give a play by play on where they went in the site like SlimStats does.

Has there been a change recently? Can people block cookies to keep them from being seen? What would be the problem here?

Thanks

https://ww.wp.xz.cn/plugins/wp-slimstat/