Corruption gear gives you debuffs, that make no sense. How to use upgrade finder where corruption gear isn’t included?
In your Best in Bag settings, you can choose a corruption threshold that you are willing to play with. You can set it to zero if you do not want to deal with any of the negative effects. Upgrade Finder follows those settings.
Keep in mind that you can get corruption resistance, which will eventually allow you to equip corruption gear without dealing with the negative effects.