"a question on" usually means: "a matter on the topic of" and thus can only be applied when you can insert the phrase "the topic of" after the "on", while "an issue about" can employed prior to nearly anything. Stack Trade network includes 183 Q&A communities which includes Stack Overflow, https://maroonbookmarks.com/story19897394/the-ultimate-guide-to-hoodies-manufacturers-in-pakistan