Font Size Error, only displaying Numbers and not Letters #1

[onshoremanover]

I used the HelloWorldAmoled example.

I changed the text to "Hello World 123" and changed the font size to 6 instead of 4.

Somehow the Letters do not display, only the numbers so I only see "123".

I should however see "Hello World 123" just slightly bigger. Of course This is just an example. I discovert this phenomenan in my own slightly more complex code and fell into a rabbit hole. I do not know where the error is here. Maybe with the rm67162?