4.7.6 ver. reported instead of 4.7.5

Hello,
I have updated weeks ago all of my WP websites from version 4.7.4 to 4.7.5 (Czech). But now it reports that I have 4.7.6-alpha-40770 and recommends to update to another 4.7.6 nightly build. Could you please help me to resolve the issue? As I do not want to stay within devel. version of WP. Could I simply reinstall 4.7.5 without ruining of my database, please? Or should I await for official release of 4.7.6 and then update it to stable version of 4.7.6?

My variables in version.php file:

$wp_version = '4.7.6-alpha-40770';
$wp_db_version = 38590;
$tinymce_version = '4506-20170408';
$required_php_version = '5.2.4';
$required_mysql_version = '5.0';
$wp_local_package = 'cs_CZ';

Thanks
Michal