-snip-
Anyways, I have a suspicion that the private keys file actually don't belong to me and it was installed when I installed Btcrecover, so I am seeing someone else's transactions?
Do you mean the private keys in the dump file in your first command?
You should've expected it since you had pointed a test wallet file in that command's arg's value, the ones pre-included in BTCRecover. (
blockchain-github-v1-1_main_privkeys.txt)
I though you were testing its --dump-privkeys functionality when you used that specific command.