I've got both bitcoin and dogecoin buttons side by side and they both work the way I'd expect, with one exception: I had to include
auto_show="false" or else the page would scroll to the top when I clicked on the buttons. When I included those values the page stayed still and the popup slide in properly.
EDIT: I'm om WP 3.9.1
(forgot to specify on the dropdown, and now I can't change it)
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