If you worked from home in WA and did not work in OR, then you did not make any money in another state.
Your resident state has a claim on all of your income. A non-resident state has a claim on the income you made in that state.
Generally speaking, the income has to be made somewhere. So if you are working at home in State X for an employer who is in State Y that income would be State X income and subject to taxes in State X only (assuming State X is your resident state). If you lived in State X and worked in State Y, both State X and State Y would have a claim on your income. If we assume there is no reciprocity agreement between the states, then you would pay taxes in both but you would receive a tax credit in your resident state so that you are not taxed twice on the same money.
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