hey buddy, if your asking for help you need to give as much info as possible. Your soil mix, your ph, lighting, what your doing.
I could ask why is my car constantly stalling? who knows, maybe its battery voltage, fuel mitxture etc.
Give us as much info as you can and hopefully we can figure it out.
I think your first plant is going nute def, and your 3rd is overwatered. but thats a harsh guess.