info : SSL Lets Encrypt not working when using Win 7 on Google Crome
please test using Windows 7 OS on the Google Chrome browser
I think it's because of the expiration of DST Root CA X3 that Let's Encrypt was using. They are now using their own ISRG Root X1. See: https://letsencrypt.org/docs/certificate-compatibility/
PS: My users encountered this and can't find an easy fix. waiting for a response from aaPanel.