Odd boarder Line???

There is a weird image boarder line appearing in preview of the game. It’s a background image in background layer with parallax effect on it. Can anybody tell me why it is appearing and how to get rid of it?

If the imageup and down from the line are 2 different sprite or mosaic, so here is the tipcs : disable antialiasing on the (blue) image from the image bank.

The antialiasing (AA) is on by default on image every image you import in Gdevelop. Personnaly i would prefer itto be off…but it’s like this !

Thanks I will check it