Grey line around image when exporting as PNG from Photoshop

Hi Guys.

I really hope someone here will be able to help. I have been trawling the internet for hours trying to find a solution to this problem with no luck.

I have recently bought a Cricut machine and am using it to make die cut stickers. I design all my illustrations on my HP Spectre in Photoshop. Behind my image layer, I give the image a thick white border so that the Cricut doesn't cut right up to the edge of the image. The rest of the background is transparent (see pic 1). I export the file in PNG format to keep the background transparent.

When I print the image, however, there is a thin grey line all the way around the edge of the white border (see pic 2). At first, I thought this was the Cruict machine adding cut lines, but it's not. It appears to be a setting withthin photoshop that needs changing and I can't figure out what it is. 

Does anybody know how to get rid of this grey line? It's really frustrating and I'm at my wits end! Thank you in advance for any solutions.