Vending machine having a stroke

I've done this mistake before on a 40 character LCD, but that was over 10 years ago at this point.

If memory serves me right, you submit characters to the display sequentially, ideally in 40 character lengths that go top left to top right, wrap to bottom left to bottom right.

Looks like the software or controller running the screen gives a bad character, or having a second look (noticing the EUR gets changed to EUP occasionally) there's a bad connection to the display causing corruption.