Some particles not appearing in ortographic camera.

Hello, i'm making a 2d game with an ortographic camera and i'm using particles for some effects. The problem i'm having is that some particles does not appear at all. At first, i tought that they werent being created, but then i realized that the particles do exist in the editor screen, and if I change the rotation a bit, they start appearing in the ortographic camera. I'm wondering what is causing this, and how can I solve it. Thanks!