Strange colorless lines in my images

[Burpee]

I have noticed white-ish lines through my images sometimes and I do not know what causes it. It is taking a lot of my time trying to fix it and nothing is working.

In the past I just brought the finished PNG into PSPXI and cloned over the areas but I need a finished image for Naveed that is postwork free. That means that I have to finally figure out why it does this.

Has anyone had an experience with this happening? Seems to happen when I use bitmaps or plugins, not sure which....perhaps both at the same time?

Hope we can see the lines I've circled in this smaller image.

I can post the xar file if needed but I prefer not to if I don't have to. Thanks.