Discovered that the "Downward Slant (Neutral)" eyes are not affected by Eye Adjustments.
Viewing post in Bug Reports
Is this from the stable build? If so, there's a high chance that the adjustment are not working for all face parts (not just the brow). A workaround to this problem is refreshing the preview canvas using the refresh button on the upper toolbar. This issue also has been fixed in the latest nightly build.