When I go over 32, it ignores the random glyph and just prints a normal character.
All LCDs implement non contiguous space. Your best bet is to carry on printing to it for much longer than 16 characters, say 40 or 80 and see when they start filling up the other lines.
Not all the characters on an LCD are user definable, that is stored in RAM, the rest are fixed and stored in ROM.
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