Check the Decryption policies under Policies->Decryption.
Also, take a test website and look at the cert from outside the network/internally where you are not having the problem - method varies by browser but generally click the lock icon and then click view certificate details. Then do the same from the vpn and look specifically at the "Issuer" field and copy that data/compare it to the working example. Then go to the PA under Device->Certificate Management->Certificates and see if you have a certificate with the "Forward Trust" and "Trusted Root" usage, and with a "Subject" that matches the "Issuer" previously seen on the VPN.
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