Maybe you have a two-column table? Some vertical borders may be hidden to create the illusion of a single column (with two different text alignment settings).

On the Home tab in Word, click the ¶ icon to display nonprinting marks. Each table cell will be terminated with an end-of-cell marker (¤). (You will also see the ¤ symbol at the end of each table row.)

What do you see in your table?

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional