Did you make multiple position entries? Tell us exactly what orders you placed on which pair. Attach a screen shot is possible.
Be aware that the new FIFO rules (if you’re in the U.S.) state that each order placed for a position must be unique. If you are in violation of this rule then Oanda has the right to consider a consolidated stop loss order as being in violation of the rules.
They don’t tell you that an order is in violation of FIFO rules when you place the order! That is my gripe with this nonsense.