Weird transactions mirroring my USDT transactions appearing on Etherscan... what is this?!

To preserve my privacy I cannot share my address (please DM me if you really are interested in digging into this privately). But here's the situation:

Nothing is stolen. I use hardware wallets, so private keys are never exposed. For safety, I moved some stuff away to another wallet. But I still would like to understand WTH is going on. Some kind of scam attempt, social engineering?!

Every transaction I'm conducting on my address with USDT is mirrored with another transaction of the same amount with a token I don't know with the same name and an address with the first and last 4 letters equal to the destination address.

Example: Say I sent USDT from my address to the address 0xdead123456beef. A few minutes later, under my address's "Token Transfers (ERC-20)" tab in Etherscan, I see another transaction, with the same amount, of a token called "ERC20" on the table, to some other address 0xdEaD666666beEf, and MY ADDRESS being under the "from" tab in the table. Note also that I haven't paid fees for that transaction, so it's not even mine. The internals of that transaction are some routing that I don't understand. Even when I click on that transaction, I see my address nowhere on Etherscan!!!

Is this a bug in Etherscan? Or something scammers are trying to exploit?

I'm no noob in this field. I'm a blockchain engineer (not on ethereum though). This freaked me out yesterday enough to move my funds to another address. But slowly I'm realizing it may be a nothing burger. What do you guys think?