Forge Letsencrypt ERROR: Challenge is invalid! (returned: invalid)

So I had an issue back in March when Forge letsencrypt renewals failed. I ended up having to delete and rebuild the site on forge to get things back up and running. Unfortunately it looks like the renewals have not been working again so I am trying to manually issue a new one so I can remove the old one. Problem is when I try and so that I get this error. There are similar threads but they say to make sure the DNS records are set up correctly which they are. I am wondering is there another fix for this? Can't get any repsonse from the forge team on this so hoping someone here can give a fellow a hand.

Creating well known challenge directory...
Installing LetsEncrypt client...
Cloning into 'letsencrypt1497641525'...
Configuring client...
Restarting Nginx...
Generating Certificate...
# INFO: Using main config file /root/letsencrypt1497641525/config
+ Generating account key...
+ Registering account key with ACME server...
+ Done!
# INFO: Using main config file /root/letsencrypt1497641525/config
Processing domain.ca with alternative names: www.domain.ca
 + Signing domains...
 + Creating new directory /root/letsencrypt1497641525/certs/domain.ca ...
 + Generating private key...
 + Generating signing request...
 + Requesting challenge for domain.ca...
 + Requesting challenge for www.domain.ca...
 + Responding to challenge for domain.ca...
 + Challenge is valid!
 + Responding to challenge for www.domain.ca...
ERROR: Challenge is invalid! (returned: invalid) (result: {
  "type": "http-01",
  "status": "invalid",
  "error": {
    "type": "urn:acme:error:unauthorized",
    "detail": "Invalid response from http://www.domain.ca/.well-known/acme-challenge/2UFlHz0BH7wZCld9zfv09uwfpKYcRtK3hJboZ7k-nsE: \"\u003c!--\n                              |\n  __ `__ \\     _` |   __ \\    |    _ \\\n  |   |   |   (   |   |   |   |    __/\n _|  _|  _|  \"",
    "status": 403
  },
  "uri": "https://acme-v01.api.letsencrypt.org/acme/challenge/YUD_tqLk7NVLX6s84FwaeWKMUbc5TXQAc6V3hBVJa8U/1353789835",
  "token": "2UFlHz0BH7wZCld9zfv09uwfpKYcRtK3hJboZ7k-nsE",
  "keyAuthorization": "2UFlHz0BH7wZCld9zfv09uwfpKYcRtK3hJboZ7k-nsE.-383PFv7SmF22NkwU1M_nI03hKiykde0sg1hDPVqrMI",
  "validationRecord": [
    {
      "url": "https://www.domain.ca",
      "hostname": "www.domain.ca",
      "port": "443",
      "addressesResolved": [
        "XXX.203.4.45"
      ],
      "addressUsed": "XXX.203.4.45",
      "addressesTried": []
    },
    {
      "url": "http://www.domain.ca/.well-known/acme-challenge/2UFlHz0BH7wZCld9zfv09uwfpKYcRtK3hJboZ7k-nsE",
      "hostname": "www.domain.ca",
      "port": "80",
      "addressesResolved": [
        "XXX.203.4.45"
      ],
      "addressUsed": "XXX.203.4.45",
      "addressesTried": []
    }
  ]
})