Sounds like they were under filled. You might have to add more
juice, if you have some. It could also be that they are original 808 cartos, with original filler, which does not wick all that well, certainly not as well as a Boge. Burnt means coil is dry, for whatever reason. See how they are after putting them down for a bit, to see if they rewick
juice to the coil.
If you fill them and they still taste burnt, yes, it was a bad batch, and depending on their carto return policy, you might be able to get them replaced. Contact them.