I understood what was happening.
I connect affiliates through emember connection via After Login Page and Automatically Log into Affiliate Account. And when a member is created, automaticaly, a affiliate account is created too, with the same member password.
But, when a member ask to change his password, only the emember's password is changed. The affiliate password is still the old one.
The member is trying to connect with his new password received by email, but it doesn't work because Affiliate wants the old password.
Is there any solution to this problem ?
Thanks again for you're answer.
By the way, I Don't know why, but now, login appears in the email password renewal.