Why am I getting lots of answers to my questions that don't show up on the question?

Could be someone reported the links in your questions as potentially malicious. It wouldn't necessarily clear the notification, but wouldn't show up under your question any more.

There are a few reasons this might happen:

1. The user deleted the answer before you saw it in the question

2. The answer was reported and removed before you saw it in the question

3. The answer is hung in the spam filter and only shows up for the user who posted it. It needs to be edited to get it to show up for others, but if the OP doesn't realize no one else can see it, they don't know to inquire about the issue and find out what to do to get it through the filter.

From what you describe, it sounds like #3 is the reason (spam filter)

It may be because of glitches or the answers were deleted by the users themselves or reported.

If you see Answers in Notifications but not the Question its Due to the Answer got Reported and Deleted after the Notification for it was Sent out Yahoo does not update there Notification when Someones Answer gets Removed

It's a glitch. It's disappointing when one of them is a best answer and you can't award it.