Its been weeks since I asked 5 well received questions, but I haven't yet received the Curious badge. Can anybody tell me the reason to this?
The requirements for that badge are five well-received questions, and a positive question record. You've fulfilled the first requirement, but not the second.
You seem to be pretty close to even, so it shouldn't take many more well-received questions to fulfill that requirement, as long as you can avoid poorly-received questions.