LINCOLN, Neb. (AP) — A review of Nebraska prison sentences has found that nearly one in four inmates received sentences that were too short or too long because of errors in how “good time” credit was applied  The Department of Correctional Services said Tuesday that credits were not appropriately applied for 1,242 of the 5,258 inmates who qualified for the credit.

Corrections officials say 518 of those affected were not awarded credits they had earned, while 724 received credits in error. Of the 724, there were 446 that were released early, and six of those committed a crime during the time they would have been incarcerated.

Director Scott Frakes announced the review in June to clear up lingering problems with the department’s procedures. Frakes says the prisons now use software to verify sentences.