Boolean Behavior is Backward

I have used the Boolean modifier many, many times. It works as expected... except for tonight.

I am making ball and vase magic trick, and using boolean to cut out a sphere... using subtraction, like I have many times... accept when I was doing subtraction, it was doing addition. SO, I did addition, and it did subtraction. This is the first time it happened.

I am using Cheetah 7.4.2 in Catalina 10.15.6

Funny, I planned on this, and made copies of the entire object, and planned on splitting the top and bottom. For the top, it worked as expected. Is there a setting I am missing?

Thanks.
 

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Any time booleans act weird, first check to see if your polygons are watertight. Then, check the normals of your surfaces to make certain one or both shapes haven't been flipped.
 
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