Used stamps exchanges.

It seems it's still possible to downgrade past evaluations ...

Someone just had downgraded one of my sendings (of a couple of months ago) because they haven't liked the grade I gave them yesterday ... See https://100stamps.club/stamps/RU-2144

Your stamps have arrived at destination!
Exchange id: PT-949
For: dubrava
Country: Russia
Sent: 02 May 2021
Received: 22 May 2021
Feedback from your partner: 4 stars

And today, suddenly !!!! tchan, tchan! Just 3 stars!

At the moment it is possible to change ratings of exchanges from the last 3 years. I think this possibility should be deleted or updated, maybe change ratings from the last month...

я отправляю вам то -что получаю от вас,много ли вы получили марок СССР ?

it's abnormal ...... already seen the number of accounts he has