hey. I just did a test with my own wallet, and it only has the tx that I operate.
But I checked other addresses that transferred USDT at the same time as you, and they had similar situations.
The following is just my guess.
You may have interacted with an insecure protocol. It tracks your transfers, generates new addresses that are very similar to yours, and then sends worthless tokens that look like USDT from your own address.
Since the addresses are very similar, you may accidentally copy these scam addresses and transfer your tokens to them. 
This is just a guess. Because it cannot explain why the protocol does not steal your token directly, does it not have the relevant permissions? 