The first most obvious reason is the range or area of temps was not great enough. Like too large an area of heat. This will not allow a large enough cooler area.



Consider, snakes WORK from cool to heat, so cool is very important.



We all know that exposure to too much heat will indeed render males infertile. It will also allow for the sperm to die in the female while its being stored before fertilization.



Also a common cause it adding or upping the heat in the spring(bringing them up tooooo sooon).



ALso, when they are infertile early, they can indeed be fertile for the second or third clutches.



Early in the development of allowing them choices. I commonly experienced first clutch infertility. Then later clutches were perfect. The reason was, early on I did not use a cooler or air conditioner, later in the year I did.



Again the cause was tooooooo much heat.



Also like any method, you must learn what is important, not what you think is important.



I am glad you have patience, as many here think they can try something new once and it should work. That is not very likely is it. Like with anything, you need to work the bugs out. Cheers.

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