Metatag Description field or Body:Summary(weight)

I am using metatag module, when i wrote my custom description they show ok. But when i have wrote and summary then drupal show for meta dercription the node summary and not the Description field in metatag. This is normal?

Why is bigger weight the node:summary and not the field Description?

i have an article and i want to make a custom summary to show and then for Description i want the field in meta tag Description...

thank you