If any texts are written in a form of 'project card keyword + integer' on a card/page in Mingle - e.g. card 1 or #1 - it automatically becomes a link to a card regardsless you want it or not - e.g. card 1 or #1.

If you ever want to escape from it, you can do so in Mingle 3.0. Try -

<escape>card 1</escape>

or

<escape>#1</escape>

Then it will not be rendered as a link and will be shown as a normal text.