m0useanswered grow question 2 years ago I've had this before, I was told the seed shell does not separate from the leaves all that well and then they get caught and the tips rip off.
It will be a bit slower but will still grow. Might be from older seeds?
If the rest of them are fine, it a isolated issue with this one strain and nothing to worry about. I doubt the water is an issue given the success of the others, Seedsmafia had weird business practice, none of the images on their site are of their own plants, all sourced from other sites and they are just reselling seeds, white label, not really breeding them.
Best of luck with the others!