Hi Jean
How are you adding the links?
When you're in the editor, you need to click the image first to select it. With it selected, click the link button, then select Course Link. Then, find the page you're trying to link to and click OK.
It sounds like you have what's called an "empty link". If a link in anything on a webpage is empty, it will - most likely - just point to the page itself, it depends a little on what browser you're using. So, I suspect that you didn't get the image to link correctly. After you save the page after adding the link, you can actually find out by right-clicking the image with the link and clicking "inspect". The developer tools will now open and you will see something like <img src="...">. Whatever is in src="..." is where the link points, so if you need to troubleshoot further you can see here if the link is empty or pointing the same page that the image is on.