seedlings dying

Potentially overwatering, and they also have root competition at that size. You should transplant them asap (though you could leave one in those pots, for now), some will probably take shots, but if you don't they'll all be useless.

You have to many in there. They will be fighting for space with there roots and will all be fighting for the nutrients. It would have been better for 1 seed in them pots.

Those pots with plants at the perimeter makes moisture control difficult. At the edge of a fabric pot the plants will dry out quickly. Possibly being too dry on one side and too wet on the other. The center of the pot is a much happier place for a young plant. Plus, transplanting is more damaging with the roots grown into the sides of the pot. If you have one plant in the center than you can just pop it out of the pot as a root ball to reduce transplant shock.