JSON returned by OpenCalais is (sometimes) not a valid JSON response

Hi,
first of all: thanks for this great tool! It's really astonishing what OpenCalais does!
However, I am currently stuck using the API. I am OC to parse HTML text. Everything works fine, except the fact, that the resulting JSON is invalid.
For instance, OC returns something like this:

    "http://d.opencalais.com/genericHasher-1/5715cdb9-ce78-389a-a45d-86c0bd4045df": {
        "_typeGroup": "entities",
        "_type": "Technology",
        "name": "Alpha",
        "_typeReference": "http://s.opencalais.com/1/type/em/e/Technology",
        "instances": [
            {
                "detection": "[                           How does the Wolfram ]Alpha[ input                           "x^2
            ]","prefix":" How does the Wolfram ","exact":"Alpha","suffix":" input<br> "x^2",
            "offset": 152,
            "length": 5
        }
    ],
    "relevance": 0.313
 
The problem here is that the text x^2 is preceded by a quotation mark (") - see the line that starts with "detection".
Is this an OC bug, or am using the API wrongly?
Thanks for your kind support,
      Christian