Zero withholding on any given paycheck or on the W-2 itself is a function of the earning for the pay period or for the year. I made the assumption that the earnings were quite modest above that sometimes leads to $0 or very little Federal income tax withheld.
I have no context to address the last part of your question. I would suggest you ask the employer for why the paystub is presented in this way @Tiffanyh87
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