Potentially it could be that a base layer was over flashed. It looks on my phone like the light skin colour may have been used as a base (phone too small to check) and the top ink is falling away.
Either way, it appears to be a curing issue, as mentioned.
If that customer has any left unworn and unwashed, take it back to the printer for another curing and rewash to test.
Either way, it appears to be a curing issue, as mentioned.
If that customer has any left unworn and unwashed, take it back to the printer for another curing and rewash to test.