There can be several potential reasons for this. I would recommend checking out the following Support article for tips on how to troubleshoot problems with images caused by Leap:
How do I set up or troubleshoot Ezoic Leap?
Specifically, the 2nd video will help troubleshoot issues with images.
If you are still unable to determine which setting may be causing this, please feel free to reach out to our Leap team by navigating to your Ezoic Dashboard > Speed > Leap > Create Leap Support Ticket.