Try right-clicking it in the browser and selecting Inspect, to view the selector in the browser developer tools. Then modify your extraction based on the selector. You might be trying to extract it from the wrong element.
If you're not sure how to modify it, share screenshots of what the element looks like when inspected via the browser developer tools, and also a screenshot of the selector you're using in either Extract data from web page or Get details of element in web page, and we might be able to help you.