Hotspot with Google Chrome can log in multiple times

Dear All

I’m using 6.47.7 Hotspot with User Manager.
Profile is set with limitation to allow upload 10M and Uptime 1d.
Constraints, Shared users is set to 1.
I put *.google.com in Walled Garden allow.

So the observed behavior is , with Firefox, when I reached 10 M, it stopped and ask to login again, and I failed to login.
With Chrome, it says something about not secure, then I choose to proceed, then it automatically login again, and the download quota able to increased to another 10M, and so on.
It repeatedly able to automatically re-login and continue with increased quota.

Anybody observed the same behavior ?

Thanks