In some instances, the LL extension is detecting an ISBN from the "related reading" section and serving an Alternatives pop-up for this. The extension is scraping the page to find all the ISBNs that are available and then checking the holdings. If the main title isn't in the holdings but the related title is, the related title is being suggested in the pop-up.
There's no way at the moment for the extension to know that a particular title is a related title and shouldn't be recommended, it's just looking for ISBNs on the page and searching for them. An ISBN scraper config similar to the DOI scraper config we currently have would prevent this from happening.
