This happens when you add our custom code and the Facebook new Like button code together in your templates. There is one simple troubleshooting solution which is.
Remove Facebook Like + Send Button
If
you have added the like button combined with the send button then
kindly remove them and replace them with the Facebook Like Button
Optimized version that I am using at the moment.
To remove the Like + Send button read this tutorial,
- Facebook Like + Send Button
Add The New Like Button Code
To add the Like button alone which loads fast and is much better then read this,
- Facebook Like Button
Let me know if you needed more help. This works like charm.