It seems it should be working accurately.
There are 2 things I can think of that might cause different landing location:
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If the character root transform and the target root transform are on very different heights the distance will be sloped since the vector is fixed length in 3D. The further away the character and the target are, the closer to the horizontal distance the vector will be. The way around this is to remove the Z components when you take the positions.
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The timeline points might not be at exactly (0,0) and (1,1). Double check them by selecting them and typing the positions if needed.
Happy coding 