secondary screen overlapping on the main screen

[vhalvim]

Hello,

I started on linux this week, but there's one thing that's bothering me:

There's ~2px of the secondary monitor appearing on my main screen, on the left side (look the attached image).

Does someone know what the problem is, and how to solve it?

PS: Both monitor are LG FLATRON E1941, which doesn't have manual screen position settings.