Inside my 5 pack , I got 6 seeds
Half of them are still in there, here's the other half
All 3 planted popped, just let the soil dry out before replanting them into their own tubs. It's a bit heavy to be playing with young roots yet.
And the answer to your question is, because I only had one tubs worth of compost in the house, and it was raining, so couldn't be arsed going to the garage for more. It'll be fine.