Waiting leads not increasing

I have created a flow which triggers a Welcome email based on the value of a specific custom property (“Level”) of the email recipient member. The flow triggers the email after 8 hours of adding the member to a specific list.

While adding members to the list manually, I add the standard properties and save the member details. Then I edit the member details and update the custom properties. 

After doing this, the “Waiting” count in the flow analytics does NOT increase.

Kindly assist.