Why does Google Play Store not list an app that's installed on my device?

Hi. I'm trying to update an app (EasyCert by Tysoft) on my Samsung Galaxy Note 10.1, but it's not showing as an installed app in Play Store and if I search Play Store for it it doesn't appear.

However, if I search Play Store on my Galaxy S7 phone for "Tysoft" it is listed as the first app.

All help much appreciated.

Thank you

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