Guild Wars 2

Hi, I have an issue with the artificing station. I have 4 +7 agony infusions and for some reason I cannot craft the +8 agony infusions anymore because the recipe is missing from the artificer list.
+9 infusion recipe is available though and I am sure I am not missing any steps, as I have crafted +8 before… Anyone else experienced this issue? Any idea how it can be fixed?
Thanks,
Ioana

Can you get to the +8 recipe by selecting the +9 recipe and hitting the + box on the right?