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I was encountered with the similar problem some time back, I fixed it by replacing the image by a Transparent Image. Not sure if you're using a transparent image. If yes, then try to vary the Size from the marks card.
There are several sites online from where you can download the transparent image such as Find High-Quality PNG Transparent Images Backgrounds - PNG All
Hope this helps.
Great link Manoj - the images on there are perfect and actually include transparent backgrounds which work well with maps.
I'm glad I could help!