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That's because apps are not entirely moved to your external card. Is this your issue?
/t5/Xperia-Z3-Compact/Xperia-Z3C-issue-after-transferring-apps-to-SD-card/m-p/970607#M9612
You should also read this:
/t5/Software-Updates/Apps-moved-to-SD-card-still-reserve-space-in-internal-storage/td-p/956195/page/...