UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:62.0) Gecko/20100101 Firefox/62.0

Steps to reproduce the problem:
1. Go to https://tituloelectronico.uach.mx/
2. Page displays NET::ERR_CERT_AUTHORITY_INVALID

What is the expected behavior?
page to dont display certificate error

What went wrong?
Chrome doesn´t load that page and displays:

NET::ERR_CERT_AUTHORITY_INVALID
Subject: *.uach.mx

Issuer: COMODO RSA Domain Validation Secure Server CA

Expires on: 11 jun. 2019

Current date: 25 sept. 2018

PEM encoded chain:
-----BEGIN CERTIFICATE-----
MIIGSjCCBTKgAwIBAgIQD/KLJ3nC6LifrWOBP8zYxTANBgkqhkiG9w0BAQsFADCB
kDELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIF2DCCA8CgAwIBAgIQTKr5yttjb+Af907YWwOGnTANBgkqhkiG9w0BAQwFADCB
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NVOFBkpdn627G190
-----END CERTIFICATE-----

Did this work before? N/A 

Chrome version: Versión 69.0.3497.100 (Build oficial) (64 bits)  Channel: stable
OS Version: OS X 10.11
Flash Version: Shockwave Flash 31.0 r0