Double visitor log entries for the same IP

Using the latest Piwik Mobile. Piwik on last version before 3.0.0.

No idea why, each IP would have exactly 2 entries in Visitor Log.

Is this a set up issue? Could this be caused by tracking the hidden image AND the Piwik.js code at the same time?

Here’s a screen capture.

Yes if you track via image + JS tracker code, all visits will be counted twice.

Great.

If I remove track-via-image, and user is using ad-block which blocks piwik.js, how should we handle this case?