Appealing overpayment?

I’ve seen a couple posts about this but can’t find a resolution. I just found out today that the state is requesting repayment of all my benefits. I am late on the appeal because I moved after getting a job so I did not see the notice until now. I submitted an appeal but I have no idea why they are saying I owe. Has anyone had any luck here? I haven’t filed since August and I saw something on their website saying it could be a mistake if I haven’t filed or received payment recently, could that be it?