Hi @ThaDafinser we're experiencing some bugs when User selected is set to German (which changes locale in PHP causing bugs rendering floats #6631 #6620 ). Can you reproduce this issue in German and English language?

Hi @ThaDafinser do you still have the issue in latest Piwik?

Yes still the same problem.

I notice the same issue. Here is some additional info about this:

I believe the issue lays in kartograph. Here is a bug report in kartograph related to noverlap mode of kartograph (which the visitor map is using): kartograph/kartograph.js#47

In the attached screenshots, you can see the missing points appearing after i hacked kartograph a little bit, following instructions in kartograph issue 47. However, the "fix" used is not correct as city points are actually overlapping..

Current implementation with noverlap mode:

"Fix" as proposed in kartograph issue 47:

Kartograph isn't maintained anymore, so it's unlikely, that a possible fix might be provided for that library.
I'm unable to say if the "fix" might cause other problems, like overlapping points or similar.
If you are able to provide a PR that fixes it we might consider to merge it, if it doesn't cause other problems... Otherwise we hope to be able to work on #11929 at some point to fix all map related issues.