why does a 1500 rated question from div1 + div2 feels way harder than a 1500 rated question from div2?
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It's not like human can set same level of difficulty problems in every contest. You found some 1500 rated problem from div1 + div2 feels harder then a 1500 rated question from div2. I also found vice verse.
In my experience, the length of the contest affects the calibration of the problem rating (at least in terms of implementation difficulty). I think it's because in a longer contest more people will have time to solve it so the user rating of the average solver will be lower
I believe that a rating of x on a problem means that half of the people around that rating will be able to solve that problem. Since Div 1 + Div 2 usually have higher rated participants in general, a 1500 rated problem might be harder in general than a Div 2 1500 rated problem.
This would make sense if Div1 + Div2 had higher rated participants around 1500 rating, but why would that be the case?
True. And it's much harder to get the same performance at Div.1 than at Div.2.