It is caused by the incorrect setting of paragraph "Indentation and Spacing", which can be solved by resetting. The specific operation steps are as follows:

1. First, we create a new Word document or open the edited document content.

2. Then select the position at the beginning and end of the paragraph where the paragraph spacing needs to be set.

3. Then right-click the selected location to open the dialog box and select "Paragraph".

4. Click to enter the paragraph options panel.

5. In the Indentation and Spacing tab of the Paragraph Options panel, enter the values we need in the value boxes, such as Before Paragraph, After Paragraph and Line Spacing.

6. Click OK to end the operation of setting paragraph spacing. At this point, the setting of paragraph spacing and line spacing is completed.