Looks like you ran into a bug. I'm on xbox too and it functions as it should be, i can see all blueprints i've learned so far.

Best regards.

Did you click on the blueprints in your inventory so that they disappeared out of your inventory? Once you load the necessary materials, the modifier boxes are still black. You can only load modifier materials into boxes that connect to the initial materials in the adjacent black box, the black box above and the diagonal black box to the initial materials boxes. You can't load modifiers in black boxes that only connect to the red X boxes. You click the black box and your "cursor" will move to your materials at the bottom. You can only choose the ones that light up. You can then refine to get 1 of the lit materials if you don't have one available and then click on that refined material and it will load into the black box you had selected.

There might be a bug.I an on Xbox also and it woks properly , all the blueprints are there and are visible.