They used a product similiar to concrete on our pool, I think it was called gunite(?). Anyway, after they poured it we had to wait a few days for our liner to come in and it rained hard during that time. The concrete product cracked just as you're describing. The pool guys spent a whole day repairing spots.

Needless to say they were pretty ticked at the pool company (they were subcontractors) for not having the liner ready to be installed as soon as the pool bottom was prepped.

This will be a major issue if not repaired because the liner will be placed over jagged edges and could rip, plus it won't be nice and smooth and you will see the cracks or at least the uneven areas.

I'm sure they will fix this so you probably don't need to worry...unless of course they don't fix it.