Hey @Smooth 

I think this is probably due to the font color being changed once a link is added to the text.

Can you click on the block that has this unsubscribe link and go to ‘source code’
 

<a href="http://www.yourlink.com/" style="color: #cc0000">your text that is linked</a>

If you see something like the above in the ‘source code’ - the # code that you see might be white or similar shade that would give you an illumination that the text with the link disappeared, so try changing the color of the text to a hex code that is darker tone/color or make it same to the color of the other text surrounding it.

If the above code is not present, just add the above code snippet and see if this gets fixed. 

Let me know if this helped.

Thanks,
Arpit Banjara