It's a product of the format being parsed twice. Each line should be 80 characters with an = at the end, then a carriage return+newline(lf) to continue the line. Somewhere the cr+lf got converted to just an lf and then when reparsed it removed the lf plus the next character, making it still conain the equals but not the next letter of the message.

Here's a better technical explanation if you care: https://youtu.be/SVVnkNZWJhk

it is some old formatting getting converted incorrectly I believe, though I don't remember the details