Question on address reuse

Just made a transfer to a new cold wallet, using a brand new Receive address... however when I review the transaction online at Blockstream.info, the Privacy Analysis shows 'address reuse'.

Is this most likely because:

1) The "Send" address is being reused;

2) 1 or more of the other "Receive" addresses (in a one-to-many transaction) is a reuse (presuming mine to not be an address reuse); or

3) Possible user error on my part?

If #1 or #2, aka my Receive address was not a reuse but someone else's was, what are the privacy considerations / risks I have to be aware of for myself?

Thanks in advance