Unable to login account

I didn’t enable 2FA and I can’t login to my account.

I’m getting “Email address/password do not match.” error.

But I didn’t change my password.

Have you tried to go through the password recovery option?

Yes, after I recovery and set the same paassword again, I am able to login now. But what was the problem, should I worry about my account security? But I didn’t get any notification email that says “somebody else accessed my account” from Cloudflare.

I don’t think there is a security concern, sounds like a snafu logging on. Nonetheless, it’s always good to worry about security. As a precaution you could change the password, rotate your API key and enable 2FA. Ultimately, you want to use some sort of password manager that takes care of the details for you. But, first things first.