The formula is inserted into the article in the form of an autoshape. The default layout is "embedded", which moves with the text, that is to say, it belongs to the same line of text with the following serial number, so the centering effect is the centering effect with the following text. Solution:

Method 1: delete the space between the formula and the following number, add a space before the formula, and move the formula to the middle.

Method 2: Right-click Formula-Format AutoShape-Layout, select "Floating on Text" and select "Center" below.

Method 3: Set the row where the formula is located to right alignment, just delete the space between the formula and the number and move the formula to the middle.

Recommended method 2. Although it is troublesome, all formulas will be aligned in the center and will not be misplaced.