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Do you have deactivated the option „Simulate spam“?
I’ve just checked your page: It has JavaScript-errors:
VM16:2 Uncaught TypeError: jQuery(…).addClass is not a function
VM24:3 Uncaught TypeError: $.each is not a function
Therefore the PoW-script doesn’t run on client-side and thus every submit is recognized as beeing spam.
I hope this helps.
Cheers
