It looks indeed -- from your screenshot -- like you've got paragraph rules enabled as a default setting currently in your document.
Before you place the Word document in your InDesign document try the following:
- Edit > Deselect All (to ensure you have nothing selected).
- Type > Paragraph Styles - ensure [Basic Paragraph] is selected.
- Type > Character Styles - ensure [None] is selected
- Type > Paragraph. From the Paragraph panel menu choose Paragraph Rules
- Select Rules Above (top left menu), ensure Rule On is not selected.
- Select Rules Below (top left menu), ensure Rule On is not selected.
Also if you are inserting your docx into an existing text frame, check that at the insertion point (click with type tool as insertion point), the Paragraph Rules are disabled.
Next try and place your docx again. Hopefully that'll resolve the issue.
Cari