Freehand mask tool Add expands mask well beyond existing border

I'm trying to use the freehand mask tool in Add mode to "smooth" a mask edge. Instead I get a considerable expansion of the mask near where the freehand addition was done. Below are 2 screenshots, the first showing the tool as a triangle  , the second showing the resulting mask just after a double-click of the tool. The freehand mask tool used to work very well and exactly but no longer does.

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  • I have found the same thing occurs whenever I use the free-hand mask tool, even without smoothing. I have resorted to "guesstimating" where the marquee is going to land. I will sometimes use the "Paint On Mask" function to refine the messy parts of the mask.

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