Need to clear a cache 
Autor: Arnold K.
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It is necessary to clear a cache after sending the post form because captcha is not clear. Users don't know about it and can't send next messages. Please make auto cleaning of cache in program.
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Hello Arnold,
this depends on your user's browser settings. I suggest you add a message in your form stating that they should press F5 to reset their chache. That's the only thing you can do I'm afraid at the moment.