Please select orhtogonal quality in meshing. then you can check where are those elements. please see following video to locate bad cells.
once you locate the locations, you will need to do mesh or geometry modification.
please do geometry modification if it has sharp angle or small faces or tangency etc.
in meshing you can change the face or edge sizing to reduce mesh skewness.
there are many posts regarding mesh quality on this community. please search.
If this helps, please mark this post as 'Is Solution' to help others.
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