Because modern English is a combination of ancient Celtic languages with the various languages of the British Isles’s numerous populators and conquering forces across history, including but not limited to: Latin, German, Norse, and French. And spelling wasn’t really standardized until the printing press was invented, due in part to class stratification. But that’s another story lol. Suffice it to say, it’s more than a bit of a hodgepodge and you just gotta take it for what it is.