"Why there is no X?" vs "Why is there no X?"

Question

Here are the two ways to ask the same question:

1. If <something is true>, [then] why there's no roof?
2. If <something is true>, [then] why is there no roof?

([then] is only for clarification, in writing it is omitted)

Q1: do both 1 and 2 mean the same and make sense to you?

Q2: does 1 or 2 sounds broken to a native speaker? (I mean countries where English is the main language, like Britain, USA, English speaking Canada, Australia, New Zealand). In other words, would you as a native speaker be surprised to hear something like this from another native speaker? Like a discomfort, ringing a bell, thinking "is this man a foreign spy?"

Q3: same as Q2, but would you cringe to read something like this in a fiction book?

Q4: same as Q3, but for historically non-English countries like India, or generally your impression as an internet user. I believe internet English is its own language, so non-native perspective is also interesting.

I am asking because I've noticed that ChatGPT corrects 1 -> 2, and my intuition says otherwise. My intuition comes from 15+ years of reading technical and fictional literature, browsing forums, and watching media in English, but I am by no means a scholar of English and don't live in an English-speaking country.

I've been told to read Why is the structure interrogative-which-word – subject – verb (including question mark) being used so often? Is it grammatical? but it is too technical for me, couldn't follow through.

If it really belongs to English-learners please tell and I will move it.

Answer 1

People can argue until they're blue in the face, but to me (1) is ungrammatical and unacceptable in standard English. If I were to read it in a book, I would assume it's published without a professional edit.

A wh-question with an auxiliary involves two movements, moving the wh-word to the front and moving the auxiliary to after the wh-word, as in (2). (1) is not even an in-situ (echo) question, where there is no movement; that would be:

There's no roof why?

You can't have the question with half the movements.

Answer 2

In the title, the correct and more grammatical way to say it is the second one. "Is" should be placed, because if not, the sentence would have more errors versus the other one. But if it is, it should be more "front" of the sentence.

Example of this:

"Why is that so scrambled?" vs "Why that is so scrambled?"