Lightvalues around torches are not correct and lightlevels shown on blocks are to low. Lightlevels shown in F3 screen are also incorrect. Sky light is also not shown correct.

I'm standing in a house with a stair rooftop and next to a torch. Still the lightlevels that are shown are not corresponding to what it should be. because of de low lightlevels that te game reads mobs can spawn where they shoudn't.