Why is Series 7 trade in value so low?

So, I was looking to purchase the new series 8 ultra after the event today. I have a 45 mm stainless steel series 7. When I entered my serial number and the trade-in value is $155.

When I bought this series 7, the trade-in value of my aluminum, series 6 was $250 on the day the series 7 was released for both myself and my fiancé.

is this some type of glitch or are the aluminum and stainless watches both only worth $155, $100 less than the previous model year’s aluminum watch trade-in values?