That's just lack of familiarity.

For this family of languages, it's very uncomplicated and easy to parse (and they all "sort of look the same" if you squint). Consider this: if you knew nothing of Java or C, their syntax would be weird mumbo-jumbo to you too. Even a language which is considered relatively simple, like Python, can trip you up in unexpected ways if you're unfamiliar with it.

Fortunately, getting familiar with the syntax is easy. Doubly so if you actually tackle a project with it.

Coming from a Java/C/Python/JS background, it's hard to casually read OCaml snippets before first getting acquainted with its syntax, because it belongs to a different family of programming languages.