Could really do with more information on your workflow, a full screenshot also helps.
My best guess,
Alpha to selection > cut selection which leaves some semi-transparent edge pixels. Paste and scale leaves the edge pixels behind. example: https://i.imgur.com/5RCIF3t.mp4
A few ways depends on what is around the graphic. Alpha to selection then grow the selection by 2 or 3 pixels. Cut , paste, scale. example https://i.imgur.com/ceSnasr.mp4
If the graphic is all alone on its own layer then just resize the layer Layer > Scale layer.
My best guess,
Alpha to selection > cut selection which leaves some semi-transparent edge pixels. Paste and scale leaves the edge pixels behind. example: https://i.imgur.com/5RCIF3t.mp4
A few ways depends on what is around the graphic. Alpha to selection then grow the selection by 2 or 3 pixels. Cut , paste, scale. example https://i.imgur.com/ceSnasr.mp4
If the graphic is all alone on its own layer then just resize the layer Layer > Scale layer.