I don't think that is a font problem. its hard to read with the gold on blue, but it looks like the top row has 15 letters, and the 2nd has 13. Most rows have 13-14 letters, but the occasional 15 pops in there.
They just stuck as many letters on each row as it took to make them take up (roughly) the same horizontal space. The font they used in not monospaced/fixed-width, so it takes a different number of letters depending on which letters are used.