Vapor tongue. Or try giving your juice a good violent shake.
If the OP has only been vaping for 2 weeks (and I could be totally wrong; perhaps OP meant vaping
that particular flavor for two weeks) I would be
HIGHLY skeptical that they are already experiencing flavor fatigue (I suppose it is possible; but I have never heard of such an instance). If it is a taste/palate issue; I would be more inclined to agree with
@WillyZee that it
may be a changing/healing palate.
Sorry, not directed to any individual, but I gotta... <begin rant now>
I believe that "vaper's tongue," or "flavor fatigue"
can be a a legitimate problem; but it seems (to
me) to becoming the
common scapegoat for all vaping woes. Unless an individual's taste is shot/off across the board (vape, food, beverage),
I think that this is often inaccurate, and unhelpful. Before attributing problems to vaper's tongue; first ask "Do all/most/many e-liquids lack flavor? Does the symptom cross over into foods, and/or beverages?" If the symptom is only linked to one e-liquid, or one particular device, we do neither the afflicted person, nor the vaping community at large, a service; to just dismiss it as vaper's tongue, and blithely move on to the next post.
We hear "vaper's tongue" so often; that we dismiss poor set-up ( improper power settings, airflow), bad technique (e.g. coil building, wicking), inappropriate devices (for the desired result), substandard e-liquid, and who knows what-all else; as just another case of "vaper's tongue." It is easy, no one can say we're wrong, and who knows what it really entails anyway.
(I am convinced that) It does happen; we can overload/overstimulate our sense of taste. But what does it take to invoke it? And how might it affect us each individually? What are each of our own personal thresholds? Until we have a better understanding of what it is , what triggers it, and what we can do to counteract it;
I feel, that time and effort are better spent ruling out other more(?) controllable/understood(?) variables.
Okay; I'm stepping down off my soapbox now. Sorry for getting so preachy.

<rant over>
I am still inclined to believe it is more likely due to inconsistencies in the vape shop's production, and/or handling. (the few shops around here, that used to offer their own proprietary blends, all had similar reputations for inconsistencies).
@stols001 also has a valid thought regarding manufacture age. If it is an extremely fresh batch, and hasn't had time to mature ("steep"
(man; I hate using that term)); I could see the possibility of the overall profile not yet coming out. I DIY my own juice, and have more than a couple of recipes that just don't taste like much until the individual flavors have had a chance to blend and balance out. Some creams are non-existent for the first couple of weeks, while other custards just seem to overwhelm anything else in the mix for 3-4 weeks; as just two personal, albeit anecdotal, examples.
Sorry, but without
@Smiieth (the OP) providing more info, such as:
-- vaping history
-- vaping setup/gear
-- expectations
-- comparisons with other e-liquids used (preferably during the same time period)
-- e-liquid profile in question
-- personal health
-- ???
We are all just grasping at straws in the dark. Just my opinion...
