May not be a bug but very odd. Fail on creating Purified Velium Impacted Raw Diamond came back with You failed the combine, but you managed to recover Velium Drying Solution. It has been left in your inventory. You have fashioned the items together to create an unexpected product: Acidic Water
You hit an Alt-Fail, and I had to have something in there, so... I left the Acid. And you Salvaged the Velium Drying Solution.