I moved to the current state I live in 3 years ago, and suddenly the state income tax is being withheld in the old state I moved from No changes were made at work, do I need to file a nonresident tax return?
Unfortunately, yes you do need to file a non-resident return in that state you no longer live in, report zero earnings, and ask for a refund. Contact your payroll department as soon as possible to request they fix this mistake. Your resident state is being underpaid and you will likely have interest charged to you.
Check with your company payroll people to discuss the issue.
Maybe there was some sort of computer reset...and the wrong state got put in there.
IF it was actually sent to the correct state, they need to issue you a corrected W-2 showing the proper state.
IF they actually withheld for the wrong state, and paid to that state...then you'd likely have to file a non-resident tax return for that state, indicating zero $$ of income for that state .
(If the two states involved are reciprocal tax states, the process may be different. Some reciprocal tax states have special forms that make it easier).
In either case, you need to contact HR/Payroll to make sure it's fixed now for 2025