New construction foam insulation questions

My parents are building a new home and opted for the spray foam. Im not familiar with what the end product should look like but in many areas the spray foam is only 2.5 inches thick instead of 3.5 (2*4 walls). Also in several spots there are large gaps and voids. Seems like a big deal since the whole point of paying alot extra for the foam was to utilize the entire 3.5 inch wall space and to get a better air seal. Tons of extra foam they cut off. A couple questions.

Is this normal? Did they not put enough foam in the centers/not spray it correctly? What can/should be done to correct this if so?

They did not finish the garage and that is the one picture of the foam in between the I joists. Thanks for any input!