Very easy explanation...
BESTA GLASSVIK, which is the current door name, comes with a set of hinges inside the box (+ screws). If I can throw an assumption out there, the suppliers were probably told to stop making the older article # doors. In hindsight, they probably stopped making them way way too early.
GLASSVIK, which happens to be what the new door is called, is just a door... The hinges are sold in separate packaging.
Heck just to make you guys feel better, here are the descriptions for the "new" GLASSVIK doors
GLASSVIK Glass door, black/clear glass,*23 5/8x15 "
GLASSVIK Glass door, black/clear glass,*23 5/8x25 1/4 "
GLASSVIK Glass door, black/smoked glass,*23 5/8x15 "
GLASSVIK Glass door, black/smoked glass,*23 5/8x25 1/4 "
GLASSVIK Glass door, white/clear glass,*23 5/8x15 "
GLASSVIK Glass door, white/clear glass,*23 5/8x25 1/4 "
GLASSVIK Glass door, white/frosted glass,*23 5/8x15 "
GLASSVIK Glass door, white/frosted glass,*23 5/8x25 1/4 "
So for BESTA, for each new door you buy, you would buy 1 bag (or package) of hinges. Each package comes with 2 hinges. And you buy however many shelves you want. It's just like how STUVA is setup (as far as shelving goes).