title: Metric showing higher value in blended data when date range comparison is added
body: <p>I have two data sources in Google cloud storage buckets. I am blending them in Google data studio as follows:</p>
  <p><a href="https://i.stack.imgur.com/H2lMs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H2lMs.png" alt="Snapshot of blend configuration" /></a></p>
  <p>I have created a simple table chart which is working fine:
  <a href="https://i.stack.imgur.com/4ZXz5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4ZXz5.png" alt="enter image description here" /></a></p>
  <p>But when I set <code>Comparison date range</code> option to <code>Previous period</code>, the cost numbers displayed in the same table go haywire but the summary row which displays the total cost is fine. I don't observe this issue if the data is not blended.</p>
  <p><a href="https://i.stack.imgur.com/41KFi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/41KFi.png" alt="Google Data Studio visualization with Comparison data range enabled" /></a></p>