Unlike many email clients, which show different messages with the same subject line in chronological order as they come in, Gmail groups all such messages together in a "conversation view". This can make it easier to organize and keep track of email threads, as well as present a tidier inbox display, However, if you really don't like it, you can switch back to the more traditional view. Instructions for how to do this are provided below.
You can also learn more about this and other Gmail configuration topics in our "First Things to Change" video tutorial.
Your inbox will now show each incoming email individually.