Anyone experienced purple buds after using Clonex?

It's probably genetics. A cannabis plant can't turn purple unless it has genetic markers for it. There are ways to pull that gene sequence to the front of the line with stress or temperature, though.

I've not used Clonex but weed is not like, say, carnations that will absorb the color of the liquid and send it out to its petals or flowers. I think genetics is playing a part here but since you don't have a diary and we don't know what you're even growing, can't say for certain.