Variable Germination

I’m very disappointed with my first sowing of the much-heralded new blight-resistant tomato ‘Losetto’.  While the other varieties achieved between 80-100% germination, I have a solitary Losetto i.e. 10%.  It was sown in exactly the same way as the other varieties, so it can’t be the technique or the compost.  I will try another sowing, but I would be interested to hear if anyone else has similar problems.