Soils too loose? Baby plant fell over! +REP

Well i dont know how to explain this but today one of my plant tilted over.

I came back and found one of my plant looking totallty heathly fell sideways on the soil.

I found out since i have been watering only around the outside part of the pot that the soil around the stem is pretty light and loose. I straightened the plant with soil and stood it back up. But when i tap the plant the plant falls completely over so easily...

This one plant i am using as a dummy test plant so please tell me what i can do/try.
Or is this normal during seedlng stage?
Should i water near the stems and try to pack down the soil?

Thanks! Will rep whoever can help me out

pic might help ....or at least you will get a more accurate reply..

this happend to me when i was flushing , just put some more soil in and stabilize it

i've had this happen on my first grow because using not enough light caused the plant to stretch very early and couldn't support itself. is it very tall and slender?

the plant that i had fall over repeatedly i just left on its side and the entire stem touching the soil became part of the roots and turned out a very large stalk of a plant.

I think i have enough light and its not the stretching i think its the fan. Another plant fell over and its the plant getting the most blowing. So ill try to straighten it out.

Will post some pics later.

1 of my plants tops tends to be bending over onto the lower leaves to support its self some days and its always in the direction the fan is blowing so that might be taken apart in it. today i put a straw down there and lightly straitend it out with fishing wire. my plants are short and fat not stretched idk if this would be a option for u?