There are a few potential reasons for this:

  1. Some of the links have already been added in your account. We don't allow duplicate links to be added. 
  2. By default we only show one link per domain. When importing, you can choose to see up to 20 links per domain. In that case, more links should be added. 

You can set up the link limit per domain in the popup that appears when you click the "Import links via file upload" icon (in Your Links section):

3. You have checked LIVE LINKS ONLY when adding links. In this case, when the links are checked, the ones that don't exist any longer, are removed.

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