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the hair particle doesn't follow vertex group as well enter image description here

enter image description here

enter image description here

here is my blend file :https://drive.google.com/file/d/1osJKSJDKA6hDJFH4cxW4IFEMRwk_FFRm/view?usp=sharing

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If you enable Face Orientation in the Overlays you see that your mesh is completely red instead of blue, which means the face normals are turned inside out.

flipped normals

So it is not that the hair grows from the wrong faces, it grows to the inside and due to its length you see it come out on the opposite side.

To correct this, go into Edit Mode, select all faces with A, then Shift+N to recalculate the normals. Now all faces should be blue and the hair grows correctly.

corrected normals

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    $\begingroup$ thank you very much sir. its really helpful for me :) $\endgroup$
    – nemeshine
    Commented Jan 23, 2023 at 9:16
  • $\begingroup$ @nemeshine You're welcome. Generally some things to always check if something doesn't work as expected: are the normals flipped, is the scale not applied or are there duplicate vertices/faces? $\endgroup$
    – Gordon Brinkmann
    Commented Jan 23, 2023 at 9:23

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