It may be steeping a little bit. The DIY I make is vapeable the first day, but kind of harsh. By day five or so it's settled down, but my recipe is so simple and contains very basic flavors that tend to settle down fast anyway.
One thing to do with a
juice you don't like is set it aside for a week or two, then try it again. In many cases, it smooths out and becomes much nicer.
Warranted, I've had a few that tasted like socks when I tried them. Post-steeping, they just got more sock-like.