title: Why do my breakpoints duplicate in Visual Studio?
body: <p>I recently started having problems with breakpoints in Visual Studio 2010. When I set a breakpoint and then start debugging, another breakpoint appears on some other line nearby. The screenshots below shows the editor after I set a breakpoint, as well as the breakpoints window:</p>
  
  <p><img src="https://i.stack.imgur.com/3Lzz0.png" alt="Editor"></p>
  
  <p><img src="https://i.stack.imgur.com/wHmvL.png" alt="Breakpoints window"></p>
  
  <p>As soon as I start debugging, the breakpoint duplicates, as seen in the following screenshots:</p>
  
  <p><img src="https://i.stack.imgur.com/X5J8h.png" alt="Editor while debugging"></p>
  
  <p><img src="https://i.stack.imgur.com/c8pRr.png" alt="Breakpoints window while debugging"></p>
  
  <p><strong>Why is this happening and how can I stop it?</strong></p>