I don't think you understand what I mean. I've provided a picture:
In the picture, you'll see the HTML code underneath. The highlighted Like button is in the HTML. Directly above that Like button is also another line of text about the Warranty. It's hidden on the page, but the text is definitely in the HTML. So, something in your template is causing that text to be duplicated. It's not the Like button itself.
To test even further, I'd say to remove the Like button altogether and put a lot of text in the description area. I'm pretty sure you'll see it duplicated just like the Like button is. If so, again, that will prove that it's not the Like button causing problems, it's something with that view that is showing the description twice.
Hope that explains, but if not, please do the test with a lot of test (many sentences) and no like button to see if it's shown twice. Then, let us know when that test is up so we can see what's happening.
Thanks,
Alex