That must have been a mistake right . Was it CPFP ? It's a one input , one output tx , and the output address shows 50 btc and the input shows 130 btc , so did they spend 80 Bitcoin , and the fee was about the same ?

Or was this the transaction that was used as a CPFP to get a much larger TX confirmed ?

I'm so confused by this , but that is probably because I don't really understand everything to do with the mempool and all of that .