When the flavor changes, either your equipment, the
juice, or your taste buds changed. Less nic would give you less TH and take away some native nic flavor, but you should get MORE of other flavors. Juice consistency from the same vendor is a known problem in
vaping too. Nicotine and other ingredients will darken a juice over time and the 10 mg you got could have sat longer before reaching you. Some juices taste better with steeping (shake and let it sit).
If your equipment is in good shape, my first guess would be your taste buds. It seems to hit about 3-4 weeks into
vaping. Are you trying the 10 and 24 mg side by side? Is there another person who can compare the tastes? How do other flavors taste to you?