Uneven growth

Bad pictures aside I need an opinion or twelve.

most of the cells are doubled up, however i am seeing just some random growth from certain adventurers, with no real regard for species.

They are in fresh soil with a heating wire and a standard temp of 29c.

Previously, the same setup, just less insulated with a constant temp of 24, produced great even results.

Now, I see three possibilities:

1. I'm just a nervous nilly.

2. some seeds just figured it's go time and didn't inform their friends.

3. I just got a shitty batch and I should value what I have like gold.