Armor improvement recipes are greyed out (Helena's machine at the secret places)!

Hallo Grinding Gear Games,

I have collected many recipes/instructions to improve my weapons and other gear across the maps (mostly shortly or after a boss fight), but when I use the machine at Helena's secret places, those recipes I collected show up, but are greyed out/ non-selectible, like e.g. the recipe/instruction for level 2 or 3 'double environmental resistances'. Thank you very much in advance for fixing this.

If they are greyed out it means that you have not yet unlocked them.