Case in Michigan

Question: If NCP is ordered to pay a total amount per month and it is withheld from his checks bi-weekly per the IWO. What if that total amount is not met during that month period that is ordered by the court? (off by over a hundred plus dollars) Is the NCP responsible to make up the difference?
Also, NCP claims to have a 40 hr. week job in order to have the payments taken from...but NCP has also not been showing up for work and working else where making more money but not reporting that income to FOC. He claims to have the job for the support to be taken from BUT is not making enough to pay the amount that is ordered and that amount will be going up due to modification per the information he provided to the FOC.
NCP pled guilty to felony non support, will his not making the total amount of child support payments prior to sentencing effect his sentencing?