On my singleplayer world, I thought it was about time to get a wheat farm running, but randomly when i plant Seeds they pop out 😞
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Reasons: Too little water, too little light, you're trampling your crops.
I've been playing Minecraft for 3 years now, and I know all the wheat mechanics, so no and no.
Here's a link to Example: https://www.youtube.com/watch?v=5jIu8WsD93Q&

Too dark. See http://minecraft.gamepedia.com/Light :
Uproot unless able to receive a maximum of level 8 or more from the sky
Oh... uh... well this is embarrassing O_O . Sorry, thought it was light level 6 😛
Did the farm land turn into dirt? If so you might just be jumping, destroying the crops.