when transplanting, you dont have to wet the whole medium. i'm guessing you watered the whole gallon of soil til run off? or til it was wet? might have been too much for the roots to handle. just, when transplanting in the future, especially if its hot soil, just water up to where the rim of the rootball/old soil is. and each watering, water a little more outwards. And i'd recommend using recharge. it makes plant growth explode and helps with deficiencies. since using, my plants dont even have much of a down phase when i transplant.