It's rough when you expect juice to taste the same every time and it doesn't. I remember one vaper posting a picture of several bottles of juice received at the same time in the same box. I don't think any two were the same shade in his picture. Unless lighting was playing tricks, he had light amber all the way to medium amber and various shades in between. I don't see how juice drawn from a single container could do that and I don't think they mix one bottle at a time.
I have fallen for juices that knocked my socks off and reordered several times, never getting that wonderful flavor again. I finally didn't order any more. I voted with my feet.
Not to say that it's your issue this time, but we all have taste bud ailments from time to time. If you still have a little of the old bottle left, it would be interesting to compare the two to see if it's juice causing the lack of flavor. I can't count the number of times that people posted that their juice (same bottle) tasted fine yesterday, but today they can't taste anything. Taste is subjective and is also dependent on smell. About 80% of what we taste is governed by our ability to smell the aroma as well as taste the juice or food. Taste buds can detect salty, sweet, bitter, and sour. The rest is a magical combination of those in addition to our brain interpreting the rest by adding the smell input.
Taste and Smell FAQ