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It is 'responsive', so it works regardless of the device's viewport width.

I would say it is not the POF module contributing to this. Rather, the 'verification code' is CubeCart complaining that the reCaptcha gadget is not agreeing with the solution provided. It might not be displaying when it should be, or the customer worked out the puzzle, but the solution is not correct. Please verify that, in admin, Store Settings, Features tab, Bot Protection section, the reCaptcha is enabled as desired. Then, assure yourself that your browser is not blocking the javascript needed to fetch the reCaptcha gadget from Google.