have you tried removing the seed casing...?
Seeds are kind of like a baby plant with a small battery...and as soon as that seed cracks open the battery starts getting used...the baby plant has only so long to make it out of the soil with some leaves to start making energy, before the battery dies and they are stranded without...so if you plant a seed to deep and the battery dies before you see leaves then that is that...but when you plant too shallow---(which happens to me anytime I use a paper towel to germ) if you plant too shallow then the whole seed pops up through the soil, and can sometimes reharden...I got some autoflowers I was super excited about...like checking the mail 2 and 3 times a day excited...anyway got them and germ'd 5 in a papertowel, and as soon as I saw a shadow of a root tip I planted them into jiffy pucks but to where the seed was like barely covered...and they all sprouted up...some the next day and 2 the day after, but they were all stalks with seeds attached...and I decided to wait a few days and see if they emerged on their own...and 2 did within 3 or 4days... but 3 plants were still stalks and seeds...so I sprayed the seed casing with water all through the day and then very very gently peeled it off...of each one...and on one I broke a cotyledon, but no harm done since it had weirdo white tiny true leaves sticking out...they had started to grow but got no light and just ran out of chlorophyll...as light deprived plants do...anyway...once I got the casings off they were fine...even the broke one with the white leaves...and they got their color back within 6 hours of being under the light...only one plant was female...and she ended up being a weirdo the begin with...as soon as she started growing she had 2 identical tops, but I hadn't topped her...and she wasn't the one with the weird leaves......blah blah blah none of this matters...at least try to peel off the seed casing before you decide to trash them...this is true stuff I am giving you here...but I too was disappointed in the yield of my lonely little autoflower, but she was mostly seeds...because the others were male and I ordered this pack to make seeds...so I could whimsically throw one in if I had an opening....so I mean it served it's purpose, but I figured there would be something to smoke...once you got the seeds out...and I guess there were, but only like 3 or 4 grams...lol. She was only 7 inches tall with 2 shoots and all the way up it was just 2 colas, but I didn't let her finish out...she looked great the whole time...and at one point in early veg before she showed sex I actually accidentally watered her with Lysol that wasn't even diluted, so had to frantically repot...and since I wasn't planning on repotting anything just then I managed to leave her in the bag of soil while I went to get a pot, and then forgot I had put her there and just turned up the bag to fill up the pot...thusly burying her...but I dug her back out, dusted her off, stuck her in the new soil and she kept on keeping on...but as I said there were too many setbacks..I can't wait to do one I don't mess up...I mean through all this her growth never stopped, her leaves never even yellowed...I feel she could have yielded more than just seeds if I hadn't pulled her early as well...but I was waiting on those seeds, and since she was pollinated the moment she showed hairs they were ready...got hundreds of seeds though...I don't how I didnt hear the plant click when in the path of the fan...it was hilarious...but seeds is what I wanted and sweet heavens I got them...had to sweep them out of the floor underneath where I hung her to dry... So, I was disappointed in me... just like i will be disappointed in you if you don't at least try to see if something so simple is the issue, before just saying awww man....