Paypal Order Status

Up until today, when a payment was completed through PAYPAL, order status was set to PAYMENT RECEIVED. Today, for one order paid through PAYPAL, the order status changed to "BACKORDERED" instead of PAYMENT RECEIVED. Note that the products do not allow backordering (out of stock actions set to "none") and the addon seems to be configured correctly (i.e. for completed payments, status set to PAYMENT RECEIVED). Any idea of why could this have happened? Has PAYPAL changed something?

i have regular little issues like this with paypal, seems to come and go wven though I dont make any changes.

Please check order statuses log in the log mamanger. Looks like inventory is decreased twice due to statuses settings