Association for Computing Machinery (ACM) style is not based on the sequence

Why is it that when I use the Word plugin, ACM-style references are listed not in the order in which they appear, but by the first letter of the author's last name?

For example, first a J's paper in-text citation like "[1]", then when adding a B's paper in-text citation after J's will turn to "[1]", and J's will turn to [2] automatically.

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