I reported this bug in the MCP thread but Arsuru noted that it exists even if not using MCP (comments #105 and #106).

The bug - after having brewed combo restore fatigue/restore health potions for awhile, I decided that I preferred single effect potions of restore fatigue and restore health instead. However, now whenever I make a restore fatigue or a restore health potion, the game continues to make the combination potion, even when my inventory does not contain the ingredients required to brew such a potion. And it does not matter if I try other valid combinations of ingredients for those potions or change the name of the potion, it still creates the combination potion.

Are there console commands that would let me try to fix the problem?
What are they, and what variables and values need to be changed?

TIA for your help,

John