Train no going to the good plateform at station

Hello currently i m bulding a city where the product comme by train but i encounter a small bug:
Train whant to go the midle plateform to unload but the midle platform don’t have any way to turn back , while the two other platform have a turn back rail, you can find the screenshot under for more visual explanation
and just in case yes the train can go to the other platform
i want to use the middle line to let the train go trought and use the other two to unload

i can drop the save file if needed.

Have a good day