If you are using the Lansweeper 6.0 beta, could you update to the latest beta release, if you haven't already, and see if the issue persists. We did fix some IP location bugs in previous beta releases.
If you are not using the beta, could you click the Assets link at the top of the web console, filter the IP address column and verify whether there are actually assets in your problem IP locations. An IP location will not be listed in the IP location widget for instance if it doesn't contain assets.