Check to have the lates pixel code here and that Custom pixel is saved and connected. Notice that tracking pixel is fired only on checkout_completed event, so you have to complete an order for the pixel to appear on Network. Refreshing the checkout_complete/thank_you page won't make the pixel run again since Shopify won't run the event on refresh.

For debugging, use the Test button for Videowise custom pixel in Customer events to see what's happening with the pixel in real-time while going through the order flow.