
I have made a test: create a word document with heading numbers, then upload it to sharepoint and open it by two accounts at the same time.
However, I couldn’t meet the issue as you described.
To narrow the issue,
- Create a new document and make sure the number shows correctly in document. -> Upload it into the same site-> Open in the Word application, to check if error occurs.
- Try to test in different site to check if the issue happens to specific site.
- Open the problematic document in Word for Web to check if the number is correct.
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