Why it's happening, and what should you do?
First, go to the link below and check the active status of your Gig.
https://www.fiverr.com/support_tickets/selling-on-fiverr/gigs
Click on the "Gig Status" Dropdown menu and then check whether your Gig status is Active or not.
Gig impression dropped depends on many things, but some of the basic reasons are:
Using high competitive keyword on Gig.
Your Activity on Fiverr.
Gig is not properly optimized and depends on much more.