Is brown spotting and freckled leaves normal on Oncidiinae plants?

[krienschmidt]

Hi everyone, Just wondering if brown spots and freckled leaves is normal on my Oncidiums, Aliceara, and Brassia? I have several plants with spotted leaves, all in the Oncidium family. My Phals, Paphs, Phrags, Cats have none of this spotting. Still blooming, no leaf yellowing or loss just a lot of spotting. I never water from above and probably have less than optimal humidity. Seldom gets above 40%. Should I be concerned? Thank you for your help!