Why is deanonymization happening on the site?

Question

Anonymity

There is a specific site.
The site owner allows you to comment on your articles, while the comment appears for public viewing after it is checked by a moderator. Until it is validated, the comment is only visible to the person who left it. Actually this is the question.
I leave a comment through the TOR browser (for Mac), go to the same page through other browsers on the same computer (Safari, Opera) and see "Your comment is pending moderation." I observe the same situation by leaving a comment in private mode with VPN enabled in any of the browsers in any order. When I go to another computer on the same home network, I don't see the message. Flash is disabled.
Why is deanonymization happening?
UPD: Apparently the problem is reproduced only on Mac OS

Answer 1

samy.pl/evercookie _ _
_ _
_ _ %B4%D0%B5%D0%BD%D1%82%D0%B8%D... A little thought on
"how to live with it" .

Answer 2

Delete cookies in "other" browsers.