I don’t believe I’ve encountered this before. Some of the characters are “inside-out” when created. While it may have something to do with the font itself, it gives different results depending on the characters chosen, the order they appear, and whether they are preceded or followed by a whitespace character.
Interesting indeed. I don’t have that font but I played with a couple of others that overlap but they didn’t do the same thing. I wonder if it has to do with how they overlap.