There is a chance something in your environment is different than when you germinated the other strains, white widow and golden leaf, respectively.
Germination can be tricky as you need both – the seeds to stay very moist constantly, and yet the seed and its soon to be roots need lots of oxygen(aeration). Keep this in mind when germinating, too warm of conditions lowers the rate of dissolved oxygen in water and can lead to a young seed suffocating and rotting from anaerobic bacteria before it gets a chance to start – and conditions too cold could inhibit the chemical reactions needed to jump start the seed’s biological processes. If you use the glass of water method, carefully change the water with freshly aerated water often to insure the seeds have access to lots of oxygen. A lot of us really like to transfer them to a peat or coco coir plug as soon as we can see a crack and white tip poking out of the seed, follow the directions that came with your jiffy peat plugs or other plugs and you should have a healthy seedling popping out the top of the plug in no-time.
There is also chance the seeds experienced some harsh conditions during the postal travel around the globe to your neck of the woods. If they sat in a hot truck somewhere, it could’ve killed them. You never know, and we do have the warranty. If you have already contacted us through the same channels you purchased your seeds, you should get a response eventually, they do get real busy. In the mean time I will send this up the chain to further bring it to their attention. We’ll make sure you have some healthy growing purple haze bushes soon.