I ask to help, if there is such possibility.
There are two sites WP, the basic and a mirror, are completely identical, work with one database, from the same tables in base.
At installation of plug-in Contact Form 7 + Really Simple CAPTCHA, on one site all is processed remarkably, and on the second are not processed acceptance and captcha.
All options and files are identical.
The most surprising, that the glitch occurs on the basic site, and on a mirror display normal.
Whether you faced such problem?