That is the impression I am getting... what do you think Ozzy? maybe fungus gnats gnawing on the young flesh, and then as the leaf grows the damaged parts cause the leaf to fail since they don't grow?
What conditions do you have the plant in? have you seen a lot of gnats around? any small insects that look like sand almost? or little red ones? Do you have any other plants in this area and how are they doing?
Before uprooting the plant and washing it down, an effort that will most likely send it into shock, we should make a best effort determination of what is going on with the plant.
If it is insect, I would say either make the choice of dunking the plant and submerging it, pot and all, in pure distilled or RO water for about an hour or two, that should be sufficient to drown any pests. Some people go longer, and that may be prescribed.
Note, what I said above will only do you good if you are suffering from pests.
Another thing to consider, is that you said you just bought it from a store. Many times, unfortunately, places like Lowes of Home Depot will kill a Carnivorous plant in the store by giving it tap water. Sometimes even a mile fertilizer, and many times this often ends up killing the plant slowly, and a few weeks after the potential hobbyist takes the plant home, it starts dieing, and they think it's something they did, when in reality, there was little, if anything they could do to save it.
usually your ok if you do one of two things: Get the plant as they are un-boxing it and setting up the display. or Take it home, and flush the pot with a gallon or so of distilled water if they have been there longer.
What your experiencing does not sound like either of the last two conditions, it honestly sounds like fungus gnats larvae to me, if I am reading you right, OR that your plant is not in optimum lighting conditions... If you have other VFT's in the area showing strong growth, then your OK there, and it is probably the larvae, dunk the pot in that case.