Seeing old icons in the background

Hi, I got an older Galaxy S7 edge from my dad and I'm having issue. I'm seeing icons of his old apps in the background of every screen - homescreen, settings, all the apps, photos, etc. It's like every background is a bit transparent. First I didn't even notice, then I thought they're my apps and I can turn this transparent feature off, but it's actually my dad's apps. I cleared the cache partition, did the factory reset but it's still there. The phone is running Android 7.0. Any ideas? Could flashing the ROM help?

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