both items say complete but it wont let you claim the reward and finish the quest. Strangely the description for the master infusion stone is red.

I was able to complete this with just the lesser infusion stone (I won it from a loot box) but I had to toggle back and forth between the two stones trying to complete it before it completed. I don't recall exactly what sort of fiddling I did there to get it to complete.

Sure thing, I had configured it wrong :)

Oh and thank you for reporting it.