Extra line shown in the map

[BugalloF]

Hello everyone, I'm trying to fix a bug on a project where I'm connecting differents cities around the world by their coord. The problem, as the images shows, is that one city always (or almost always) shows an extra horizontal line like going around the world. But if i change the longitude to a value higher than -64 it desapears (second image). Is this an error code or a bug?
Thanks in advance.