Geoff here. Taste buds are a tricky thing. And when dealing with artificial flavors, they translate differently on different palettes. And sometimes a flavor will taste great for a few days and then one is suddenly not able to taste it at all. We call it numb tongue or vapors tongue. And I get it myself with certain flavors. For me it’s Lemon Poundcake, which was one of my favorites.
And there’s nothing wrong and sadly, it just means that you’ll likely have to switch flavors. That’s the easy fix. And you’ll find online, people offering 20 or more different ideas of how to fix the problem, but the easiest fix, find a different flavor that works for you.