Can't close completelly a crypto position

Hello,

when I try to close completelly a Crypto position, with for example:

position = alpaca.list_positions()[0]

alpaca.submit_order(symbol=‘ETH/USD’, qty=position.qty, side=‘sell’, time_in_force=‘gtc’)

the position never gets fully closed. There’s always a small remaining quantity that I can never close.

How could close the position completelly?