Lines appearing around border of exported .PNG files.

[michaelv20320737]

I am experiencing an issue when I export Illustrator files to .PNG files. There are random black lines around some of the borders of the .PNGs. Sometimes, I cannot see them but my client sees them on a Windows OS. I am running Mojave 10.14.6 - Illustrator 2021 25.3.1. I've tried udjusting the artboards and creating new artboards but get the same results. I am attaching a file showing what my client sees. Thanks in advance for suggesions.

[lambiloon]

Hi if you want to remove this simple way is open the png file in photoshop then use eraser tool and save it again as png...regards

[michaelv20320737]

Funny thing is I do not see the lines in my files. They are appearing when the client views them on a Windows computer. So I do not see them in Photoshop - even if I move the art around on the canvas. 

[Doug A Roberts]

Do you see these lines yourself in the exported PNG if you open them in Photoshop?

[michaelv20320737]

I do not see them when I open the files in Photoshop. I've moved the image around on the canvas and still do not see them. It appears to be random too - some of the PNG files have the lines and some do not even though I am exporting artboards from the same file. 

[Doug A Roberts]

What software is the clent viewing them in? Does anything else happen between you exporting them and sending them to the client?

If they don't exist in Photoshop, I'd be inclined to think they don't exist in the file and something is happenning at the client end/in their viewing software.