Using Uppercase Letters
In general, you should not use uppercase (capital) letters when using LadinoType.
Hebrew fonts do not have uppercase and lowercase letters. LadinoType treats uppercase and lowercase letters differently.
For example, a lowercase "m" produces a mem while an uppercase "M" produces a final mem (mem sofit). Similarly, a lowercase "s" produces a samech while an uppercase "S" produces a shin.
Read more in the article Using Uppercase Letters.