Import your MAL account animelist into Kuroiru. This tool merge data from MAL (myanimelist.net) into your account. Please make sure you know what you are doing.
Wipe your kuroiru animelist
Export your kuroiru animelist
note : it's recommended to use this to your fresh / secondary MAL account, because it will repalce existing duplicate anime, including the ratings & notes data
to MAL : https://myanimelist.net/import.php