I searched the mod lists on every section for a question about a hacked Shaymin (as you described in your comment), but found nothing. Presumably, this means the answer is yes: if you log out while asking a question, it will not be submitted.
The only ways you could have signed out while asking a question are by clearing your browser cookies before pressing the button to submit the post, or by signing out of PokeBase in a different tab. A browser extension could be responsible for removing your cookies if you don't remember doing that on purpose.