Based on what you shared, you would have Non-Resident Income to report to California.
In the California interview, you will be able to indicate that only 20K is sourced to CA. However, CA does tax non-resident income.
Click this link for more info on California Non-Resident Tax.
It still seems like your W-2 is incorrect, though. If your total income for the year was 100K, then the state income should be broken out in Box 15-17 as 80K to Oregon, and 20K to California, or else Box 1 should be 120K.
Oregon will tax the 100K in Box 1 (as a Resident), and give you credit for the tax you paid on the 20K to California.
If you have already started state returns, you may want to delete them and prepare your CA Non-Resident return first.
Click this link for more info on How to File a Non-Resident State Return.
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