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What that looks like to me is called DYE MIGRATION, does the white look good coming off the printer? Or are you seeing issue before pressing?
If it looks good off the printer , before pressing, then I suggest using a little more TPU powder and curing a little longer, especially when pressing onto garments that are not 100% cotton. Also, there is BLACK TPU powder now, it makes a huge difference when pressing onto dark garments, check it out below:

I also found a really good step by step article regarding how to change a printhead in an L1800:

Hope any that helps.
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