[Plugin: wp-popeye] Shortcode attribute won't work!

I cannot get the ‘style’ shortcode attribute to work.
Every other attribute works fine just not that one.
Any suggestions are greatly appreciated.

I’m implementing the attribute with the following format:
[popeye alignment=”right” style=”example-green” view_size=”thumbnail”]

The alignment attribute and the view_size attribute work perfectly, what am I doing wrong?

[ Please do not bump, it’s not permitted here. ]