Why does mail.ru say that I logged in from an unknown device?

Question

ubuntu

All the time I log in from one PC
OS - ubuntu, installed six months ago
the chrome browser
did not change anything
And then mail.ru writes that I log in from an unfamiliar device

Location, IP, browser are the same, i.e. it was definitely me, and not someone else.
It became interesting why mail.ru could make a mistake?

Answer 1

Chrome-70 kept the mailer agent from snitching on you.
Seriously, chrome could wipe the tracking cookies during the update, or you launched it in incognito mode, so the mailbox panicked.