Dropdown button bootstrap Error

The down arrow that marks the dropdown of the navbar button is irregularly sized to the size of the button.

See the image below (Blue Button)

Navbarcode:

<navclass="navbar navbar-default navbar-fixed-top" role="navigation"><!--------- START Navbar --------->
        <div class="container">
            <div class="navbar-header"><!-- START Brand and toggle get grouped for better mobile display -->
                <button class="navbar-toggle" type="button" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> 
                    <span class="sr-only">Toggle navigation</span> 
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="#">Meu Site</a>
            </div><!-- END Brand and toggle get grouped for better mobile display -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"><!-- START Collect the nav links, forms, and other content for toggling -->
                <ul class="nav navbar-nav navbar-right">
                    <li>
                        <div class="btn-group navbar-btn">
                            <button type="button" class="btn btn-info">Bill Gates</button>
                            <button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
                                <span class="caret"></span>
                                <span class="sr-only">Toggle Dropdown</span>
                            </button>
                            <ul class="dropdown-menu" role="menu">
                                <li><a href="#">Profile</a></li>
                                <li><a href="#">Another action</a></li>
                                <li><a href="#">Something else here</a></li>
                                <li class="divider"></li>
                                <li><a href="#">Logout</a></li>
                            </ul>
                        </div>
                    </li>
                </ul>
            </div><!-- END Collect the nav links, forms, and other content for toggling -->
        </div>
    </nav><!--------- END Navbar --------->