I'm quite new with Illustrator and I have an issue that I'm trying to find a soluting for a few hours now!

So when I use dark colors on any shape a white thin line appears around it. I tried adding a stroke but the white line moves around the stroke.
This is only happening when I'm using dark colors, the lighter colors look as they should!
I tried to export as a .png & .pdf and the lines are still visible.

Without a stroke:

[![enter image description here][1]][1]


With a stroke:

[![enter image description here][2]][2]


Random light colors:

[![enter image description here][3]][3]


  [1]: https://i.sstatic.net/21ti2.png
  [2]: https://i.sstatic.net/V8ySt.png
  [3]: https://i.sstatic.net/Ev3zF.png

(Edit)
I didn't convert any image to make my design.I drew it right from the start.
I tried it again without using divide on my shapes, it still looks the same.
I tried to add Offset paths,nothing changed.Even if I add a background the lines are still showing!

English is not my first language, I hope I was understood!