Tried to install a shortlink - took down entire merch website

Hi all - I tried to use rebrandly on my website, but it effectively took down the entire thing. All I did was add an 'A' DNS on GoDaddy and it is giving me the below error - can anyone assist?

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Thank you -

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NET::ERR_CERT_AUTHORITY_INVALID

Subject: rebrandly.com

Issuer: rebrandly

Expires on: Jul 22, 2028

Current date: Dec 28, 2018

PEM encoded chain:-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

submitted by /u/chexmixmix
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