For me (0.9.4 prerelease on Win7) that isn’t appearing. Pin 19 is showing up as:
as do all the others (with different name and pin number). That operating system and Fritzing version are you using? The M is likely from the label (for module) but I’m not sure where it is coming from since it should not show in a pin label and it should have a number such as M1 for the part. Does it do the same thing in schematic and breadboard or only pcb? For me breadboard and schematic are the same as long as I am on the pin, but if I move off a bit it changes to
to tell me what part I am selecting.