You owe Oregon income taxes because you didn't have enough Oregon income taxes withheld from your pay.
Without examining your return (we can't see it in this forum), it's impossible to say exactly what caused you to owe state taxes. However, there's a high probability that at least one reason is listed in the FAQ below.
I recommend you do a line by line comparison of last year's income tax return to this year's income tax return, to see what changed.
If you're still working on your return, those numbers will likely change as you enter more items. Your tax due amount may even be replaced by a tax refund by the time you finish doing your taxes.
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