Caption numbering makes use of SEQ fields. For SEQ fields inside text boxes, the order of the numbers is determined by the relative locations of the text box anchors. To see object anchors, select that option in Office button | Word Options | Display. Once you see the anchors, you can drag them so that different text boxes are anchored to different paragraphs and in the appropriate relative order. Then update the fields.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional