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in Q2A Core by

If another answer is selected as best answer, error message is displayed.

Please click again to confirm

Since security code is outputted to HTML FORM, I guess problem inside core program. 

Q2A version: 1.6dev
i have same problem
also when voting.
Check(Compare) form_hidden_elements() in qa-include/qa-theme-base.php and qa-theme/your theme/qa-theme.php

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