LINCOLN, Neb. (AP) — Nebraska’s corrections director says state officials failed to correct the prison terms of 15 inmates after discovering in 2014 that hundreds of sentences had been miscalculated.

Scott Frakes acknowledged Thursday that corrections staffers didn’t calculate new sentences even after learning they were inaccurate. He says he doesn’t know why the sentences weren’t adjusted, but the staffers responsible were from a previous administration and no longer work for the department.

One of the inmates, Sean McGlaughlin, was rearrested on Wednesday. Another inmate, Aaron Finney, was discharged from parole too early.

Frakes says 10 of the inmates are still incarcerated in Nebraska’s prison system and will have their sentences adjusted, one is in federal custody, one is in a California prison and one was deported to Mexico.