Planted Single Seed Got 10 Sprouts?

If you are having the same things happen in other pots, then they are weeds that look like weed.

1st question - where did the soil come from? Is it reused? Is it from your yard?
2nd q - does anyone else know about them? could be playing a prank on you.

I would pluck most of them and just kill them - let the seeds you planted have the pots to themselves. But, I would dig up a few and transplant them, let them grow, and see what comes of them - just to satisfy curiosity.

That one close up really does look like MJ - but it could still just be some other kind of weed (that seems like the most likely scenario). A lot of seedlings look the same, most all of them start with 2 colydendrons.

Did you use recycled soil from a previous grow?

You either forgot or someone is messing with you. Seeds don't just magically replicate themselves in a pot.

lol in the summer the cracks between the cracks of the side walks you always see these lil plants that look like weed plants but there just wild plants or lil oak trees they look exactly the same when they sprout

I think it was a miracle. Yes sir. Those little seedlings were immaculately conceived.