I track my transits sometimes 3-5 times a day and this is a question of mine also! Great observation.What Ive observed from my own behavior and experiences, based off this transit and others, is the planet transiting your natal Chiron will color your Chiron in that way for that period of time.
I have Chiron in the 5th in Virgo square my natal mars.
Moon transiting my Chiron really makes me emotional and overly dramatic when I express myself. It brings a wave of emotions to my self-expression which is either good or bad depending on the aspect and if I've made peace with my Chiron and very afflicted mars for that day!
Sun transiting Chiron puts a focus on all things related to your own natal Chiron. Good or bad depending on aspects.