Looks like overspray to me. I tend to get this with createx when using too high a pressure. It's very hard to see until you back it with a bright colour.
I find it worse spraying in a cold environment
If it was paint in the airbrush you'd not get this effect - I clean the airbrush with a quick spray of water for createx type paints. then a couple of quick blasts of the new colour onto a tissue.
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