There are many reasons in backlinks suddenly dropping, and we can not predict one reason for the backlinks dropping. Meantime, every tool having different different behaviour and guidelines to analyse and shows accurate links. So we need to study them as well. So, bellow I list out some points for the backlinks drop.
- Manual search engine penalty.
- Algorithm updates.
- Links Loss.
- If the site redesign, migration, or other changes.
- If sites get hаcked
- In case you get penalized for user-generated spam
- In case of the notice is for redirects.