wrong key when new user

Hello,

(config multisite 3.4 with theme_my_login)
I have a problem when i want create a new user.
i create with default template of my-registrer-form.php a new user.
it sends an email to the correct email but with a wrong key genereted.

ie of the link /
https://www.mydomain.com/login/?action=activate&key=5a6035171b81cf09

when i click, it generates an invalid key error page in french
“Une erreur est survenue lors de l’activation
Clef d’activation invalide.”

So when i go to wp_signup table and replace to the good key in the url, it works and the user is created.

so what to do ?

https://www.ads-software.com/extend/plugins/theme-my-login/