I have to say that I have had this problem with their Bonkers strain which is the only one I have tried. My experience with it has been good and bad. The good is that the strain is excellent. I have been growing in the upper NE near Canada for a few years now and I have tried many different "early" strains trying to find ones that finish mid September. I am in the mountains growing personal. Most of the strains finished no earlier than beginning of October and most of them middle. Bonkers is not only the only one that finished EXACTLY mid September but also had a good yield and very good quality. Handles wet, snails and slugs stay away from it, mold never been an issue, very tough and hardy. So the strain itself is excellent.
That being said I have tried it three different years. All other seeds I average well over 90+% germination including freebees that come as part of an order. I have never had better than 15% with Bonkers in any of the three years running. Male female of germinated ones is fine but most do not crack. I was thinking maybe it was because it was the genetics, with auto mixed in kind of like mules being sterile. I know it isn't my methods or I would have such good success with other seeds, some of which I had stored for years because they were not needed. Been doing this for decades.
So in conclusion, what I generally do is absorb the losses by buying more seeds and taking what I can get. The strain is definitely worth it because the pro's outweigh the con's compared to other strains in my environment. I have just learned to accept the higher price I pay to get them.