I created a new recurring import of Twitter followers. I set the import limit to 100 and an additional 100 people were imported, totaling 200 people. I'm also seeing that the number of people imported in the Imports view does not match what I'm seeing in my database. Under Imports it says 199 people were imported, I'm seeing 200 people in my database.
4/28/17 This issue has been resolved!
We have begun working on fixing this issue and will let you know when it's completed.
I was able to recreate the problem you are describing. This is definitely problematic for managing your database correctly and something we will consider fixing but do not have a timeline at the moment. We will keep you updated!