Ghosting is a faint double image, offset a millimetre or two from the real one, and it means the same thing every time: the paper and the fabric moved relative to each other while the dye was still a gas.
1. Pressure, first
Uneven or insufficient pressure lets the sheet shift as the press opens. Check the platen across its whole area, not just the centre — most presses are looser at the corners, which is exactly where ghosting shows up first.
2. Paper weight
Light paper cockles under a heavy ink load. A cockled sheet is no longer flat against the fabric, and the moment the press lifts, it springs. If ghosting appears only on your heaviest coverage, this is usually why.
3. Fabric tension
Loose fabric moves when the press opens. A tacky spray or heat-resistant tape at the edges costs almost nothing and removes the most common cause on garments.
4. Dwell time
Over-pressing keeps producing gas after the bond is made, and that gas has nowhere useful to go. If everything else is right and you still see it, take ten seconds off and test again.
Work in that order
Pressure and paper account for most cases. Changing four variables at once tells you nothing — change one, press a test, and write down what happened.