It happens to me in almost everything I write. I go back to edit and discover questions with no question mark. Yet at the time, I am convinced I typed them. Life is better since the advent of Grammarly and similar tools, but I am always shocked at the absence of the question mark.
The brain can trick you into seeing what is not there, which is why self-edition is a poor choice for any book. However, if you know the mistakes you are liable to make it helps.
Do you have punctuation marks you miss like this? Is there one you find missing when you check what you write?