Spending max from that address is showing just one input. He's been reusing addresses or he's otherwise confused.
I agree that the OP is confused.
It would appear that the OP had an address that received payment from a transaction that had 11 inputs and 142 outputs. ie. they received a payout from a service provider like an exchange/gambling site etc that used "Pay2Many".
They're checking the transaction details on a blockexplorer and seeing "142 outputs"... not realising that only
one of those 142 UTXOs is actually related to their wallet. Thus, when they go to "max" it only shows the 1 UTXO being used as an input, as that is all that is actually controlled by their wallet.
Exactly. Well said. Thanks for breaking it down, understood.
