I had the same problem!!! I stuck 3 seeds in the AG before germing, and they all started doin real funky things.
The reason being, is the sponge will not hold the seeds in place. You probably did like everyone else and just pried the AG vegatable seeds out the sponge and replaced them with your precious marijuana seeds, right? I actually purchased the "master gardener" kits, that has the empty pods and labels. And when you apply the seeds, the instructions say you have to use non toxic glue to hold seeds and sponge in place. I wouldnt risk it if you have good seeds. Just keep checking your germs, and if they pop out, tuck it back in deep, and make sure root is down,
I think i had to do that with every plant. With one, I even took the whole germed seed out the sponge, peeled the rest of the seed shell off myself, accidently dropped the seedling on the floor, and it just so happens to be the biggest plant in my AG right now. Plants are weird creatures.
dont do what i did though, just tuck em in, and read em a bedtime story