Was on PAYE, recertified, now on IBR with no notice

I've already sent an email to Aidvantage to get clarity but wondering if this has happened to anyone else? My recertification date was yesterday, 5/6/2026. I submitted all of my recertification documentation to Aidvantage last month, they confirmed they received it, and said they would notify me once my new monthly payments was calculated.

Weeks went by and I heard nothing, recertification came and went yesterday, and when I logged on today, my "PAYE" plan had been changed to "Income Based Repayment." I was paying $406/month on PAYE and now it says my next scheduled payment will be $1828. I never received a notice about the plan change or the new payment.

I owe $192,000 and my AGI on my tax return was $81,000. I'm in California, married filing separately, no kids. There is no way this new payment could be correct right?? I've been on PAYE for 8 years and my income and loan balance has stayed almost entirely the same throughout the entire 8 years.