Off-Site Storage fees despite enough capacity

When I received the first shipment of cars for my new Retailer, I found that the game charged me with Off-Site storage fees for the whole shipment, even though I had definitely enough inventory space. I ordered only 20 cars (which I received) and the business management screen shows an inventory space of 100.

Or am I misunderstanding something and OffSite Storage fees are always charged (for whatever reason)?

@BrokenPhysics, no you are not missing anything here. You should not be charged for off site storage. We will look into this. Thank you for bringing this to our attention.