That's because the Scotts Topsoil had NO ferts and might have had pH problems too. Now the roots are going into fresh soil that DOES have ferts. THose plants were HUNGRY like ya read about. If you have a proper grow fert, or even some crappy houseplant food, mix up a spray bottle of fertilizer that you have mixed at only half the strength the bottle recommends and lightly mist your plants a couple times a day. You should see them start to green up within a couple days.