Failings in the prison system have been further detailed in a Right to Information request that reveals another three prisoners were incorrectly released from jail this year.
It brings the total botched releases to 12 in the past four years, with five occurring since November last year.
A prisoner sentenced for common assault, 32 breaches of an interim family violence order, evading police, eight counts of breach of bail and driving offences was released on July 1, two days before their actual release date.
A Right to Information request by The Examiner revealed the prisoner was in the community for less than three hours before being returned to custody.
A remandee who had been granted bail was allowed to leave the prison one day before their earliest release date on March 5.
The prisoner was returned to custody on March 6.
In January, a remand prisoner was held for four days after their release date of January 25.
The state government is investing $24.5 million over four years in the Justice Connect ICT program to centralise systems between the department, courts, police and corrective services.
But the upgrades won't be complete any time soon, leaving the prison system vulnerable to ongoing human errors.
Attorney General Elise Archer said it was the Liberal government who took action by directing KPMG to carry out an audit to understand the inadequacies and improve compliance with the processes for obtaining, entering and validating sentence and remand orders, and calculating release dates.
The report was released in February 2017, with Ms Archer saying work had begun on all its recommendations.
Brown was incorrectly freed from Risdon 28 days before his release.
After spending weeks readjusting to life outside of jail, Brown was returned to prison two days before his actual release date.
A remandee, Stone was released from jail in September despite having no actual release date. He was returned to custody without incident.
The Justice Department is implementing a new Sentence Management Division that will be responsible for calculating sentences through a stable, tiered structure, reducing unnecessary referrals of decision-making.
The division will have seven specialist staff who will be tasked with interpreting warrants and imprisonment orders; conduct sentence calculations; ensure accurate record-keeping; liaise between the Tasmania Prison Service and the courts; and authorise releases.