bbPress automatically replaces a url with html link, inside crayon

I am using crayon plugin and bbPress plugin in WordPress. bbPress allows you to use forums inside WordPress. after adding a new topic in bbPress, I noticed that the normal url is being replaced with an html link. This is because I wrote the url inside crayon code. If I write the url outside the crayon code, it is not replaced with a link. So the problem seems with the crayon plugin.
For example: inside crayon plugin I wrote http://www.example.com
It is replaced with <a href="http://www.example.com" rel="nofollow">http://example.com</a>

Please help!

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