Here are a few reasons why your DR may have dropped.
1: Other sites have gained a lot of backlinks
If you didn't lose any backlinks, and yet your DR still dropped, this could be a reason.
Think of it this way: when a DR‐100 website gets more backlinks, we can’t make it DR‐101. So instead we push all the other websites down by 1.
That’s a very raw explanation of why you might see a drop in your DR while no backlinks were lost.”
2: You are losing high-quality links
Domain Rating shows the strength of a given website’s overall backlink profile. It's measured on a logarithmic scale from 1 to 100, with the latter being the strongest.
That means that your DR will drop if you're beginning to lose high-quality links.
Do check your "Lost" backlinks report to investigate what is happening and see if you can arrest the decline.
Note: If there is a change in our crawl algorithm, please be assured that we will definitely inform you.