Lightroom CC - Using the radial filter, invert checked and unchecked, adjustments apply to the whole image
and not just inside or outside the oval. LR and computer has been restarted, also feathering not the issue
performs the same thru the entire range.
It is possible to scroll down and be applying global adjustments in the "BASIC" Panel which is just below the Radial Filter (and Brush) panel when a tool is active.
And even more confusing if the Tool panel is converted to the minimal "Amount" slider, as in this screen-clip.
So be sure you are adjusting within the correct panel.
Exactly: I had Radial minimized and only feather and effect slider showing. Result I was using the basic panel adjustments.