Answer: You didn't identify the plants so I don't know if they are getting enough light, too much or too little water, or if they are intolerant of drafts (from doors, heaters or air conditioners). Since you've only recently brought them home and repotted them, I suspect they are simply trying to adjust to their new homes, which might be quite different from the conditions in the garden center or greenhouse where they've been living. Give your plants a few more weeks to adjust and the should stop dropping leaves. If you can identify the plants, you can look them up to see if they like bright or low light, moist or dry soils. Providing what they crave will promote healthy new growth.
Best wishes with your new plants.
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