It’s all right if you updated the application to use the latest Android (possibly iOS) SDK for Facebook and released new versions in the App Store and Google Play. The last 19% are due to users not updating the latest version of your application. In addition, this information is average, so you should see its increase (perhaps slowly) over time.
If you are sure that your application was transferred correctly, you can force redirect your calls to v2.x from the Migration tab in the settings of your Facebook application: https://developers.facebook.com/apps/[APP_ID.BIZ/settings/ migrations /
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