Redirect after add my IP wo white list

Please see the following link for how to restore .htaccess:
https://www.tipsandtricks-hq.com/how-to-restore-the-htaccess-file-when-using-the-all-in-one-wp-security-plugin-5945

Also, it sounds like you have enabled the cookie-based brute force prevention feature.
Please read this to get an understanding of how it works:
https://www.tipsandtricks-hq.com/all-in-one-wp-security-plugin-cookie-based-brute-force-login-attack-prevention-feature-5994