Ink Bleeding effect. Any ideas on what it is?

Hey there guys I'm fairly new to Brother printing. I currently work for a company that uses Brother GT-3 model printers. They are about 3 years old and each prints about 700 shirts a day. I currently watch over the Quality control department and try to find consistent forms of damages and find ways to fix them or minimize them. We have come across a common form of damage that we experience about 5 -10 times a day and i am trying to figure out a way to fix the problem.

I notice it only...

Ink Bleeding effect. Any ideas on what it is?