Councillor Matt Relf, executive lead member for growth, regeneration and local planning, said quitting the party was an "enormously upsetting" decision.
"The understandable controversy around Jason's conviction and the choices he made that led to that have upset and surprised a lot of people in the group," he said.
"With the election of a new leader we hoped that would put everything behind us, but unfortunately the decision to appoint Jason back on to the planning committee was just a step too far.
"That decision was made with no consultation with the broader group.
"To stay true to our principles of integrity and democratic accountability I was left with no option but to leave, and I think others have reached the same conclusion."
Councillor Lee Waters for Hucknall Central, who was another one of the councillors to quit this week, said his decision "follows a period of reflection, and I believe the time is right to move on".
"Throughout my time as a councillor, my priority has been to listen to residents, address their concerns and work hard on the issues that matter to our community. That remains unchanged," he added.
"I will continue carrying out my council responsibilities and dealing with ongoing casework with the same commitment and dedication as always."
Prosecutors also alleged that Zadrozny had failed to pay tax on four rental properties.
The 46-year-old, who served as an Ashfield Independents councillor on the county council, was found guilty of nine counts of fraud and four counts of tax evasion.
Samantha Deakin has taken over as leader of the council but has so far declined the BBC's request for an interview.
The councillors who have quit the Ashfield Independents are:
Matthew Relf
Lee Waters
Christopher Huskinson
Dave Shaw
Dale Grounds
Ian Briggs
Gordon Mann
Trevor Lock
Sarah Lewsey
John Wilmott
Warren Nuttall
Kier Barsby
Jason Zadrozny

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