Spamcheck errors

Hi
We are having problems with spam check. We get this error after we fill the checking: Please validate your inputs! Error: Spam protection has not been solved. The spam protection is a arithmetic problem and a time lock

Sometimes it goes ok, but mostly we get this error.

I tried to deactivate the plugin, but I still have the Spam check on EBR form. Any help with this problem?

Thanks

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