Yes, it sounds like you may have two Home Office Worksheets; one for Oregon and one for California.
To look at the list of Forms and Worksheets in your return, on the left-side menu, choose Tax Tools > Tools, then 'Delete a Form' from the Tools Center pop-up menu.
You could delete both States, as you suggest, and then prepare your Part-Year California return first; then your Part-Year Oregon return.
However, the error may originate in your Federal return. Type 'home office' in the Search window, then 'Jump to home office' . Edit your Business, scroll down to Home Office under Expenses and Edit.
If you have two Home Offices shown on the 'Home Office Summary' page, delete the incorrect one, or delete both and go through the section again (screenshot).
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