Gradients don't work well with artboards
I have the same problem. I often work with multiple artboards as I duplicate an idea and then change a few elements to create a new variation. If I create a duplicate of an artboard with a gradient, the gradient doesn't duplicate in the same position so is then in the wrong position for both the original and the duplicated artboard. Even worse, when I move the gradient back and try to export artboards as PNGs the PNG doesn't match what I see in the PSD doc.
You can download a video of what happens when the artboard is duplicated along with a screenshot of the PSD version compared to the exported PNG where you can see the gradient is different. This is a big problem for users like myself who work in multiple artboards and often use gradients.
Video: https://drive.google.com/open?id=1BvMcPruiDuCMdT1iXUFRdSZNzB6YcyN4&usp=drive_fs
PSD version: https://drive.google.com/open?id=1Bwp_w9CNi9SzJpxi5WEnnOdkwOrTLECo&usp=drive_fs
Exported PNG: https://drive.google.com/open?id=1Bk7zdlQ27mPgMGRJQnvwC1ITUmJdET50&usp=drive_fs
