never had success putting seeds in a cup of water.. i put seeds into a paper towel that is damp with tap water, fold it and put it in a dark warm area. after 3 days i check and as soon as they are popped i put in rockwool starter cubes...
we have all had seeds that pop but just never seem to come up,, shit happens, dont beat yourself up,, call the place u got ur seeds from and explain,,maybe they will send u some replacments...
my opinion is seeds that pop but dont come up are simply bad seeds,,then there are seeds that never pop to begin with,,old,bad genetics,,idk?? but crap is a word that works to describe..
i have thousands of seeds,, and i have noticed a decline in sprouting seeds,, seeds bought by marc emry back then popped and came up near 100%,,, seeds bought today ive had almost 40% either not pop or pop but never grow
oh and all my seeds are kept in a fridge, stored w/ a silica packet for moisture,, i follow the best way to keep them..