Hello,
Unfortunately, if you accidentally changed your nature on your ninja tool, you will have to change it back using more nature stones.

Thanks and have a great day!

if you are certain the error was not yours, you may attempt to put in a customer support ticket to get it fixed, but please be aware you will need to provide some degree of evidence that this is the case. Here is the link you c*e.

https://support-center.oasgames.com/

Also, please refrain from insults and foreign languages.