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You need to give us more context before we can offer any helpful solutions. It sounds like - In some cases you are entering valid data, and in other cases you are not (which is why it works sometimes).
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You mentioned, <b>&quot;some cases the registering process works fine and other cases it doesn't work&quot;</b>.<br />
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Straight forward to debug.<br />
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1) Enable WP_DEBUG in your wp-config.php file.<br />
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2) Wait for error to show up on your WP debug file.<br />
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3) Fix problem.<br />
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4) Depending on exact details of your hosting, you may also have to refer to your Apache logs for full error detail.<br />
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5) You may also have some sort of Apache or PHP or MariaDB/MySQL configuration problem.<br />
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This is common, as most people use default config files... which rarely work with real world code...<br />
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Start by running mysqltuner, then clear/fix every diagnostic error.<br />
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Also, ensure you're using InnoDB, never MyISAM, for your storage engine, as MyISAM long locks can create problems like what you've described.
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Random Aside: If you'll be running large traffic through your code, start with Linux + latest stable Apache/PHP/MariaDB + FPM PHP + HTTP2 (not available with Windows) as your starting point.
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IT Service Manager  

Apolo Victores

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We found a recaptcha &nbsp;issue during the procss,, we took out this and everything went OK.<br><br>Thanks!
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Hi,<br>removing Recaptcha is a risky solution.<br>What was the error you got in console (right click inspect)?
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It is simple web page that request some data in order to be registered in a Client database, we are using &nbsp;Google Chrome and Microsoft Edge,, but the weird thing &nbsp;is taht in some cases the registering process works fine and other cases it doesn't work,, because a message apperars that say " please check our info and correct"&nbsp; but nothing else is displayed.....
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It is simple web page that request some data in order to be registered in a Client database, we are using  Google Chrome and Microsoft Edge,, but the weird thing  is taht in some cases the registering process works fine and other cases it doesn't work,, because a message apperars that say " please check our info and correct"  but nothing else is displayed.....

Problem with a Wordpress and Woo comerce page.

Chrome is a free web browser created by Google. Originally released in 2008, it has grown to become the most used desktop web browser (as of October 2016).

Chrome

WordPress is a free and open-source content management system (CMS) based on PHP and MySQL for creating websites and blogs. Features include a plugin architecture, a template system and strong management, customization and search systems; through its dynamic presentation of content, webmasters have the flexibility to create websites easily.

WordPress

Microsoft Edge

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.