I mean that there are fibers sticking out from the printed side that, when brushed, overlap with the shirt color. Sorry, thinking about it now, the opposite of fibrillation could also mean that the shirt color is showing through the print. What I mean is that the print is overlapping the shirt color because the discharged fibers of the shirt art sticking out from the printed area.
Does that make any sense? To clarify, the penetration isn't the issue. The discharge color is fine.