It is not unusual for boxes 1, 3, 5, and 16 to all be the same number on a W-2. That just means that you did not have any tax-deferred deductions taken out of your paycheck, such as contributions to a retirement plan through your work.
Without more context or information about where you see that message, I cannot say whether the statement about your gross pay being adjusted to produce your W-2 is correct or not.
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