After click the URL of verify_email, redirect to MFA page in spite of set MFA invalid

I’m sorry that I’m not good at English so It is difficult for me to tell about detailed situation.

Yesterday I noticed redirection to MFA setting page before redirect to login page.
I could see for a moment because immediately redirect to to login page.
After that situation, verification was success.

I don’t know why suddenly occured the case.
Please tell me If you know about this.