Not all juices but it can't hurt to let it sit for a few days. Try taking the cap off for a few days and then put it back on and let it sit 2 more days. Should get a Lil darker. What do you mean by weird taste? Do you have any other juices you compering it too - vanilla based?
Altcig customer service is great, try contacting them ( Phone call prob best), and explain your concern. I'm sure you will be happy, it's my main
juice vendor for the last 10 months or so and I love it, never had a problem.
Feel free to PM me if you need help or have questions