You received a stamp detail warning with your Online PDF proof if your design contains fine detail that may not reproduce as desired.
We do not recommend including small white (negative) spaces or thin lines under 1pt line thickness in your rubber stamp design. These details may not reproduce correctly when stamped, as the ink has the tendency to bleed or fill in. Please note the results from stamping the artwork will not be as precise as a printed design. These issues can be avoided by allowing more space between text/lines and making your text larger.