sales order outside planning horizon creates 2 planned order

Hello Experts,

We have some strange situation!

We have sales order which is outside planning horizon, which is creating 2 planned orders. Now considering 'There is a firmed planned order in the future outside the rescheduling check, therefore system creates a new one', both the planned orders are created outside planning horizon, hence double the demand.

As both the planned orders are outside planning horizon, could you please explain the logic behind this? Both the planned orders are firmed as a workaround.

Thank you in advance!

Greets !