Hi, I had an Ornate monitor for almost 14 years, you don`t say how young the animal is, but if a baby/juvenile you should be feeding a variety of insects as well as the other foods, if you`re using hen eggs, I suggest swapping to (fertilised), quail eggs, they`re the ideal size for the younger monitors, but offer them sparingly (maybe once per week). I don`t feed chicken liver specifically, but again, if you do, just as a "treat" rather than regularly, the canned monitor food isn`t much good, much better to feed whole prey items.
You should also offer freshwater fish (goldfish are o.k), I used trout, salmon, shrimps/prawns etc, you can cut pieces off the larger fish, but dust with a multi vitamin/mineral supplement, if you`re using UVB emmiting lamps, do NOT offer D3 supps.
Can you tell me the enclosure size and type, also, temps and humidity etc? Thanks!