title: duplication record found on the same system used at different location
body: <p>I have a weird case found in my web-based system and I couldn't find out what is the reason behind this.</p>
  
  <p>I have a web-based system, and it has been used at 2 different companies. One company doesn't have any problem while using the system, with good internet connection. But the other company have double record while saving each of the transaction, with poorer internet connection.</p>
  
  <p>For ex:<br>
  A user add a record for customer with name Helen. When the information is filled up, user clicks the save button. After saving, the 2nd company will find 2 records with same customer, which is Helen. This problem is occurred sometimes, not happen to all data entry. </p>
  
  <p>I'm not really sure about the real process on how they save the data, but according to the company staff they sometimes get this problem.</p>
  
  <p>What will be the reason behind this duplication record? Is it related to the internet connection? or there is a problem with my system?  </p>