“Invalid Merkle proof” Error on a Completed BTC Transaction

I posted this over in r/BitcoinBeginners but thought maybe I’d get some more/faster info over here

I did a really small transaction between two Blockstream Green Accounts, both on the same wallet. The transaction went through as I can see the btc is now in the account I sent it too, but the transaction has a warning mark of some kind and says “Invalid Merkle Proof” when I click it. I’ve never seen this before in any BTC transaction I’ve done. What causes this? What does it mean? And do I need to take any action here? Mostly just looking for an educatation as to what this means.