Oh, okay. They're also popular in the graphic arts and printing, which is where I first got to like them (and why I'm comfortable discussing pixels and resolution).
Letters "B","A","C" and "K" lack normal Optimization.
Like I said before, the 'R' wasn't read as a letter. For whatever reason--probably because it was lighter than the other letters--it was read as part of the background, like a gray smudge, and downsampled along with the rest of it.
The trouble with this theory is that it ended up in a string of text where a letter is supposed to be. If the program couldn't recognize it as a letter, why did it put it in the middle of a string of text?