Hi gid-2669,
According to your description, I have some questions.
What version of Office are you using now? Please following the hyperlink article to check the version and version number.
Did you edit this document on a different computer from the computer where the document was created?
What do the codes after right-clicking caption and clicking Toggle field codes?
Please try the steps below to create new label for caption to have a check.
- Back up this document first.
- Select a caption of figure or others.
- Go to Reference > Insert Caption > New Label.
- Enter an new name, such as "Fig".
- Make sure the new label is chosen for the caption, then click OK.
- Go to Reference > Cross Reference > Select the inserted value from point 3 in the Reference type dropdown list, and then check this issue.
If the response is helpful, please click "Accept Answer" and upvote it.