My run says its not verified even though its on the leaderboard. Why are some runs verified and some not?

Verified means you meet the requirements specified in the rules:

• Microphone (to clearly hear the clicking method) OR mouse-cam (One of the two is sufficient).
• If both microphone and mouse-cam are not very good (one of them must be present still), It is strongly encouraged to have a CPS tracker or Mousetron showing on screen, you can find those tools in the resources or you can choose a different tool with the same function.

This is only required for top runs (and it's not retroactive for runs submitted before the rule was added), so your run can be still approved if it's not a top time and doesn't meet the requirements, it will have a "Verified: No" variable.