Hello,
I understand your concern about the drop in your Domain Authority (DA) on your website. Fluctuations in DA can be frustrating, but there are a few factors to consider:
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Different Algorithms: Moz, Google Webmaster Tools, and Ahrefs all have their own algorithms and methods for calculating domain authority and tracking backlinks. These algorithms can sometimes produce different results.
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Update Delays: Updates to DA might not be in real-time. Moz updates its DA calculations periodically, so changes in your backlink profile might not be immediately reflected.
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Quality vs. Quantity: It's not just about the number of domains linking to your site; the quality of those links matters too. Google and Moz evaluate links based on various factors, including relevance, authority of linking sites, and the context of the link.
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Link Quality: High DA doesn't always guarantee a positive impact on your site's DA. If some of the new links are from low-quality or spammy sites, they might negatively affect your DA.
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Competitor Changes: Changes in the backlink profiles of your competitors can also influence your DA.
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Technical Issues: If Moz isn't detecting certain backlinks, there might be technical reasons behind it, such as blocked crawlers, nofollow attributes, or dynamic content.
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Content Quality: While DA is influenced by backlinks, the overall quality and relevance of your content also matter. Google and other search engines consider various factors beyond just backlinks.
Regarding your question about Moz crawling all domains fairly, Moz's crawler aims to be comprehensive, but like any other crawler, it might not capture every single link. The data provided by Moz is an estimate based on their crawl, and it might not perfectly match other tools like Ahrefs.
If you're seeing positive results in Google Webmaster Tools and Ahrefs, it's a good sign that your site is gaining recognition. Keep focusing on high-quality content creation, ethical link-building practices, and providing value to your audience. Over time, these efforts should help improve both your domain authority and your site's overall performance.
Remember that SEO is a long-term endeavor, and it's normal to experience fluctuations. If you're still concerned, you might consider seeking advice from SEO professionals who can provide more tailored guidance based on the specifics of your situation.