Commitment date in process order has partial quantity does it impact unrestricted stock

Dear Experts,

In MMBE we have unrestricted stock of 18600 but sales order getting confirmed for only 560 we have
checked relevant master data and config settings from SD .

This stock came from process order in the process order in the commitment field we havce seen 560 quantity
instead of 18600 sales order getting confirmed for this 560 only which is being shown as committed quantity in the
process order.

Could you please suggest how this committed quantity impacting unrestricted stock availability.