I'm not sure if it's really a bug. But i checked all the style vendors, and the T1 Gear "Speed- Force Spectrum" is not on discount. While all other styles (including the other 2 T1 Gear Styles) prices are reduced.
The discount actually only applies to the gear that shows up on the mechanical supply vendor in your HQ.
Oh okay, then i'm confused why so many Gear Styles have been on discount too, beside the mechanical supply vendor.