<p>See: <a href="http://meta.stackexchange.com/questions/80170/what-is-flag-weight">http://meta.stackexchange.com/questions/80170/what-is-flag-weight</a></p>

<p>Specifically: </p>

<blockquote>
  <p>Why is my flag weight not an integer?</p>
  
  <p>Because flag weight above 500 does not increase in a linear fashion, decimal places are shown for precision purposes and to show you how your flag weight is changing.</p>
</blockquote>