The atlas.js node.js server is intended to do one thing - serve your `MapImg`, `CellImg_` and `/n/n/n.png` files over HTTP. It is written for this single purpose, and will serve no other files.
If you're getting repeated requests for the same file, **make sure your `SeamlessDataPort` is port-fordwarded and included in your starter cmd**. Once that is done, the server should stop making a fool of itself. ;]