did you water after transplanting? if you didnt then thats probably what it is.
are you using different soil in the new pot? that can cause it too
and a bad job of transplanting can do it
Did you transplant into a fertilized soil? Like MG or something. Babies don't like MG and can't handle it well. Use bottled water and spray the leaves with them. They will be getting good water directly should help.
Slow down, it's a weed. They can grow through much stress and ignorance.
Your ph is fine so just keep the light backed off a little keep the medium moist and wait it out. Maybe 3-4 days.