Captcha Wrong usually is a sign that the Captcha Engine (JAC) has answered the challenge incorrectly (not a manual error at all). If it happens often, it means that the JAC plugin for that site is incorrect.
There are several bugs identified here, but the problem is that they depend on which challenge JD is given by the host's Captcha. Fortunately, most of these problems are repaired in the next major release.
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