SSD's "Used" space growing after each Erase / Format & ejecting!

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, "Used" space was 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 to 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 such erase - 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!

P.S. After erasing it's showing in Disk Utility like this:

But after I reopen Disk Utility, it shows like this again:

Hidden files:

Solution 1:

750 kB is so small, that this could easily be Spotlight indexing and other invisible files. Can you do shift+Command+. In a finder window of the empty disk to see hidden files? The original 20kB May have been a fluke before any of the files were added.

About the pictures, disk utility often doesn’t realize that the old partition has been deleted and shows 2 partitions that are each 2tb (impossible). Restarting disk utility returns it to a normal state.