I found this from Tom Hill
They're not males ime, but highly
staminate intersex females. Cannabis plants (sex) are controlled first by the XY system, but secondly (expression) by (often environmentally triggered) modifying factors located on autosomes, or pseudoautosomal regions. A female plant with a noted absence of masculine type modifiers can be said to be strongly female. When selfed her progeny will contain very few if any intersex individuals. The opposite type of plant (a female with a noted abundance of masculine type modifiers) -though they may be masked in the parent- will occasionally give rise upon recombination to what you're referring to in this thread. But they're not really males.
All plants born from gynoecious selections (born from female reversals) are females in regards to their sex chromosomes but express as females and intersex females of varying degrees (varying all the way to "it damn sure looks like a male to me") due to the presence/absence/activation of modifying factors.
This phenomenon is not exclusive to plants born of gynoecious selections, rather it is simply more readily apparent there than with male/female selections where it is masked by the expectation of seeing males in the population
