maybe not a dud, looks like it could be a mutant later, some times it just happens perhaps the shell stayed on too long, so many things, you can either keep her as i would
as i have had grows in the past a seed here and there pops wrong, they come out real nice but on the other hand you could ask yourself would you put in the extra time and effort
to grow a plant that is not growing right or start over, i day you can this far, you should start seeing a change in size and growth in at around 7 days-14 days. remember at this point lightly water here and there. try not to over water and your on your way.
it can also be how the strain grows as well.