Without knowing what the previous versions were, or what the error message said, I will venture a guess. Many times the system tries to weed out questions with little content. For example, if the original question looked like:
What to do with old ציצית
What do you do with old ציצית?
It probably would not accept it. As I explain in the conversation over here (not that I'm much of an expert) about a similar situation where the questioner was trying to ask why we read koheles on sukkos:
The body [of a question] should be more than [just the question itself]. Perhaps provide a brief explanation as to what Koheles is. Specify when we read Koheles (i.e. which day and when). Or any other information you may find relevant, that you as the "asker" already know. The key is to come up with a way of making your question meaningful on its own...
By changing around the question you eventually convinced the system that you were asking a "question of substance" which caused the post to go through.