Button duplicates when clicked twice

I am using the custom location with custom CSS. Everything is working fine except when I click on the “Like” button after having liked it already, it removes the “Like” but also creates a duplicate of the button. If I hit the button again, it will still show the duplicate of the button, but both buttons will have 1 like. This continues endlessly… If I hit the button again, there will be four buttons instead of just two, then eight buttons instead of four, etc etc.

How can I fix this?

Thanks
Abby

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