Virtually all of the backlink services face the same problem from time to time: you get a report containing all of the backlinks to your website, but as you go through the linking pages to verify the links, you actually find some of those missing or having different anchor details.
The reason is that most major backlink services are relying on the information stored in their indexes (link databases). The crawlers that collect and index backlinks are surfing the Web incessantly and are scanning about a dozen billion pages per day. Still, it may take up to 1-3 months, depending on the crawler, to complete the circle and to update all the data in full.
This means that the data may sometimes appear as outdated and the links provided in the report may already be removed (since the last crawler's visit), the backlink pages may be deleted, or the anchor details may be updated.
Initially, SEO SpyGlass provides the backlink data from our Index (SEO PowerSuite Link Explorer) and may bring up the same issue occasionally. For that reason, SEO SpyGlass is equipped with a unique feature that lets you instantly verify the status of every backlink provided in the report.
What's even cooler, is that with SEO SpyGlass, you can run a real-time verification for any backlinks gathered from your Google accounts or imported to your project manually, to make decisions based on the full up-to-date data.