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does anyone have any ideas of what is happening? Is it the T-Shirt? The DTF print?
Steam from moisture in the transfer.
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.
 

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hi bob. is this can be used for my printing issue i posted yesterday? how bout the temperature for that 2 mins hovering with the film?
Here is the issue in more detail.
Font Material property Parallel Screenshot Rectangle

This apply to all TPU products, as well as other polymers.
As you can see the optimal drying temperatures vary depending on the grade of TPU.

For a few transfers in a curing oven, I would say 4-5 minutes at 80-90C will be enough.
That's just because the film is much thinner than injection molding granules.

Alternatively hover the press for a couple of minutes, ensuring there is enough gap so the temperature of the transfer rises slowly.
 
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