New Comcast activation caused website to use wrong security certificate

I just activated new Comcast service using my iMac and Safari, under Big Sur. Everything seemed to be working correctly until I tried accessing edwardjones.com. I got onto the main page just fine but when I tried a secure login, it gave me a certificate error using the register.be.xfinity.com certificate along with USERTrust RSA Certification Authority and Sectigo RSA Organization Validation Secure Server CA. The main website uses normal Entrust authorities. I was able to get into the website properly using Firefox. It reported the correct certificates. I went ahead and restarted my iMac, which I shouldn't have to do after activating Comcast, and it now uses the proper Entrust certificates. There's no easy way to contact Comcast about this so I'd like to see if anyone else has seen this.