Steam from moisture in the transfer.does anyone have any ideas of what is happening? Is it the T-Shirt? The DTF print?
Using white ink does hide the the problem, but the prints will fail when washed.
If these are transfers you bought from someone else, preheat them by hovering the press over them for one or two minutes before use.
This should remove the moisture.
If you print these yourself, ensure they are properly cured.