Feeds Importer running multiple times
It could be that there's a bug in the parser's reporting progress. As long as the parser doesn't tell Feeds parsing is done, Feeds will keep calling the parser over and over again.

Workflow of Feeds


Fetch data.
Parse 50 first items of data.
Process 50 items.
Feeds checks if the parser's progress is complete. If not, the next 50 items of data are parsed.
Process 50 items.


When there's nothing more to parse, Feeds checks if there's more to fetch. If so, above steps are repeated. If not, import finishes.