Tax refund errors and how to amend

I relocated from Ohio to Nevada in March 2025 (physically moved around March 19 and officially stopped living/working there by the end of March). My employer/payroll company messed up my payroll setup and continued withholding Ohio taxes through April 30 before finally switching me fully to Nevada in May.

Now here’s where I’m confused:

My W-2 actually DOES show a split between Ohio wages and Nevada wages correctly. However, when my tax advisor filed my return, my Ohio tax summary appears to treat my FULL YEAR income as Ohio income, resulting in me supposedly owing Ohio about $1,000.

A few questions:

1. If my W-2 already separates Ohio and Nevada wages, should my Ohio return have been filed as a part-year resident return instead of full-year Ohio income?
2. Does this sound more like a tax filing/preparer issue rather than payroll issue at this point?
3. Can I amend an Ohio state return myself, or is this something better handled by the tax preparer?
4. If the original filing appears incorrect, is it normal/fair for the tax preparer to charge again for the amendment?

I have:

• W-2 + W-2C
• paystubs from all of 2025
• email records showing I informed my employer of my Nevada relocation in March

Just trying to understand whether I’m overthinking this or whether the Ohio filing was likely done incorrectly. Thanks in advance.