Hoping to reduce the number of my UTXOs from four to one, I ran

[this command][1]

lightning-cli -k withdraw destination=destinations_address feerate=4000 satoshi=all

The command did reduce the number of UTXOs from four to two. Why didn't it produce
just one UTXO?
What has your experience been of consolidating UTXO on Core Lightning?

[1]: https://docs.corelightning.org/reference/lightning-withdraw