If you drink an ominous bottle of a high amplifier, drinking another bottle with a lower amplifier will override the current effect. This is inconsistent with the rest of potion effects.

How to reproduce

1. Drink an ominous bottle of bad omen V.
2. Notice the current effect displaying in your inventory.
3. Drink a bottle of bad omen II.
4. Notice how the effect of higher level has been overriden.

Expected result
After drinking the bad omen II bottle, the inventory would still display bad omen V until the effect wears off.

Observed result
Drinking the bad omen II bottle completely replaced the effect of higher level.