That is the facts. Venus has a very dense atmosphere compared to Earth. Mars has a weak one. Venus is very hot and its atmosphere has a very high relative heat content. Mars is very cold at night and hot during the day with a low relative heat content. And what happens in Earths atmosphere is not even remotely similar to what happens in a green house. The green house myth has been shattered for decades, but the settled science cannot seem to get over it. The glass in a green house absorbs infrared light, which is why the glass gets hot. That heated glass is cooled by the outside wind. So very little infrared light energy from the sun enters the green house. It is primarily all visible light. That is not what happens on the Earths surface. Our atmosphere absorbs some infrared and our oceans receive large amounts of infrared, which is primarily absorbed. So infrared light from the sun is a significant factor on Earth. What heats a greenhouse is energy from the visible light spectrum traveling through the glass which eventually warms surface that absorb the light. These surfaces give off heat that heats the internal atmosphere. That warm air cannot escape. There was an old experiment where they painted the internal surfaces of a green house white. It did not significantly warm because the white surfaces reflected and did not absorb the visible light. So if you do not want your green house to warm significantly, paint the inside surfaces white and use clear glass. Infrared has nothing to do with a green house. To show how how wrong the settled science is, infrared light is all that matters with respect the CO2 green house gas. So CO2 is not a green house gas, because infrared light is not a factor in a green house. CO2 is an atmospheric gas, just like water vapor. Now the more water vapor or the higher density of the atmosphere (Venus), and the atmosphere can hold and store a lot more heat. Mars atmosphere is very thin and it retains very little heat. The most important factor on Earth for heat content is the density of the atmosphere. You can see that at sea level where atmosphere is more dense compared to mountain tops where atmosphere is thin.
So now perhaps you can understand why all the predictions based on green house gas concentration in Earth's atmosphere have not panned out to be correct. Reality has bit them in the behind. You cannot make accurate predictions with inaccurate science. The above paragraph is just the basic explanation for how they got it wrong. If you want the explanation from a physics perspective, you can download a paper from the link below.
Falsifcation Of The Atmospheric CO2 Greenhouse Effects Within The Frame Of Physics