Holy moly. Late reply but the last 3-4 posts of plants where the plant is just flipped over and completely limp is almost guaranteed to be a lack of water. Overwatering usually makes the leaves heavy but firm and it sure as heck doesn't fall limp and lifeless looking. Get those plants some water as soon as possible. After transplanting you should thoroughly water the entire container unless it gigantic. One thing that has always helped is to water just around the plant until it comes out the bottom to get the roots moving down again into the new fresh medium.