Fraudulent Points Value Advertising for Chase Travel Portal

Chase advertises a 1.25x bonus for Chase Sapphire Preferred when booking through the Chase Travel Portal, and 1.5x bonus for Chase Sapphire Reserve. However, this is fake - when using my Chase Preferred points to book, I see Basic Economy airfares available. If I switch to my Reserve card to book, the Basic Economy fares disappear, only displaying more expensive main cabin fares.

I have also noticed similar price changes when booking hotels - if I switch to my Reserve card, cheaper room types that are available when using my Preferred card disappear.

Effectively, this means Reserve points are actually worth LESS than Preferred points when using the Chase Portal for redemptions.

Edit: My Preferred card is a business card and Reserve is a personal card, not that it should matter.