Word's cross-reference feature makes use of hidden bookmarks enclosing each cross-referenced paragraph. The problem with these hidden bookmarks is that you can easily expand them by pressing Enter, or adding content, at the beginning of a cross-referenced paragraph. When this happens (and it may be what has happened in your document), recreate the cross-reference.

To avoid the problem in the future, always add content at the end of the previous paragraph instead.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional