I suggest you create new Word document and Excel workbook on SharePoint, please link Excel values in Word to have a check.
I also suggest you re-create links for one document with this issue.
Besides, it's recommended to add your SharePoint site as a Trusted Site on one test machine.
- Open the Control Panel.
- Click or double-click the Internet Options icon.
- In the Internet Properties window, click the Security tab.
- Select the Trusted sites entry and click the Sites button.
- Add your site.
Then please add your site as trusted locations in Office desktop apps.
Please note, for web location, you need to check the box of "Allow Trusted Locations on my network".
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