Beatles and leaves

Hello,
this is the pattern I created after this course. As it is my first pattern ever, I am really surprised and glad with what I got!
Some hairlines are separating the pattern tiles. I am not sure if they are visible in this image, but on ilustrator they were very clear, even in different zoom in and zoom out! I have made the background bigger than the no stroke / no fill bounding box as Melissa says in the video, but they still there. I dont understand what have happened, but i dont mind, as it is my first trial!
If some of you has an idea to help me, I'll be grateful!
Best regards!
Caroline