HELP: SSD's “Used” space growing after each Erasing / Formatting & ejecting!

[ThisIs🐵]

I bought a brand new Samsung T7 SSD, and I used macOS's Disk Utility to format (erase) it in APFS(Encrypted), scheme: GUID Partition Map.
Before erasing (brand new), "Used" space was 108,5 MB.
After first erasing as APFS(Encrypted, scheme: GUID Partition Map), "Used" space was just 20 kb.
Then I erased it again (same way as before - APFS(Encrypted, scheme: GUID Partition Map).
After second erase "Used" space was 766 kb!
Then I erased it as MacOS Extended(Journaled).
After this 3rd erase "Used" space was 852 MB!
Then I erased it back the same way as in 1st and 2nd erase -APFS(Encrypted, scheme: GUID Partition Map).
After this 4th erase "Used" space went back to 766 kb.
Then I erased it to exFat. And then back to APFS(Encrypted, scheme: GUID Partition Map).
After this 5th and 6th erase "Used" space was 725 kb.
Then I ejected it and plugged in back to my MacBook and "Used" space was 750 kb.
Then I ejected it and plugged in back to my MacBook one more time and "Used" space is now 762 kb.

What's going on??? After first erase - as APFS(Encrypted, scheme: GUID Partition Map) - it was just 20 kb.
And I can't go back to 20 kb again!
What's going on?
How can I go back to 20 kb of "Used" space?
Please help!