Why the statistics showing previous reviews while a new deck imported?

when i import a new deck, the statistics showing that 6.15 it has already been rewiewed, can i clean the statistics out?

You can export a deck with or without reviews. It seems like the person who gave you the deck exported with reviews.

Restoring to a backup and then asking them to provide the deck to you again is one solution; another you may prefer is to use an add-on to remove the old history.

tks, is there anywhere providing an add-on like that?