A single Unicode codepoint could be represented in a couple of different ways (either decomposed into 2 or as 1). Assume it’s the single codepoint representatio

A single Unicode codepoint could be represented in a couple of different ways (either decomposed into 2 or as 1). Assume it’s the single codepoint representation. The font you’re using can (and probably will) rewrite it as 2 glyphs using the GSUB table. This makes sense because it’s a more efficient way to store the drawing operations. The GPOS table is then responsible for handling the offset to put things in their right place. Main point is that it’s up to the font to move things about. Now, that may not be what was going on in your case at all but it’s possible.