I would take a look at the face of your printhead and see if you have build up on the printhead. Or if that is not it, is your spit station full? If it gets too full, it will leave alot on the printhead when it goes over to it, and can carry it back to the shirt. Those are the first things that I would check

The only other thing I can think is that your printbed is too close to your printhead. Or if the ink looks like over spray it is possible that your garment is not close enough to the printhead. Just a few things to check

Its all a science of getting the perfect settings

Hope this helps.