title: Qt PushButton Checkable
body: <p>I am using Qt Designer to create a user interface.<br>
  Everything was fine until I included a stylesheet.
  When I press a button it remains pressed, even though <code>checkable</code> is set to false. 
  Also, one of the buttons appears to be pressed when I open the UI even though <code>autoDefault</code> is also set to false.<br>
  If I remove the stylesheet, these things don't happen anymore, as expected.  </p>
  
  <p>This is the first time I'm using stylesheets in Qt Designer, so maybe I have missed something that might introduce this behavior.</p>
  
  <p>edit: Here is the part of the stylesheet for the pushbuttons:</p>
  
  <pre><code>.QPushButton {
      color: white;
      background-color: QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0  #85335C, stop: 0.12 #944D70, stop: 0.49 #5C002E);
      font-weight: bold;
      border-radius: 25px;  
  }
  </code></pre>