What is wrong with my WP_Query Arguments?

Use this one-

'category__not_in' => array( 93, 94, 95 ),

instead of-

'category_not_in' => 93,

Note: The term is category__not_in, not category_not_in. Use 2 underscores after category.

Edit: You are using-

'offset' => 1

That forces to show posts from 2nd one (skips the first post). So, it’s showing one post less! If you use 'offset' => 3, then it will start from 4th post.
Hope you understand.

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