I have two professions; Enchant and Alchemy. When I queue for Elixir of Water Breathing, which uses Blackmouth Oil x2, Stranglekelp x1, and Empty Vial x2, with the mats for Blackmouth Oil but not made yet, it queues this:
2x Enchanting: Enchant Bracer Minor Deflect (instead of 2x Blackmouth Oil)
1x Alchemy: Elixir of Water Breathing (this is correct)

Thanks! -Lucky

-- Skillet-Classic.zip
-- The items on ignore are just the enchanting rods (Copper Runed Rod, Silver Runed Rod, Gold Runed Rod).
-- I entered the /skillet commands as suggested above and tried again, which worked. Thanks :)

Skillet-Classic Post purge lua.zip
Here is the .lua zip after the purging, for comparison. Thanks again!

I'm going to guess that Skillet-Classic's database has become corrupted somehow. Please upload a zip of your global saved variables file, Skillet-Classic.lua. Try typing /skillet flushrecipedata and /skillet flushplayerdata and try again. If it still fails, then we will need to enable debugging and see if I can figure out what is wrong.

I see you have items in the ignore list. Can you show or tell me what items are in the list?

I checked my Alchemist/Herbalist and Skillet-Classic does the right thing for this recipe so hopefully, resetting the database will fix yours as well.