Here is a screenshot (from a previous thread 2 months ago, more broken since then) showing how the top 25 in the hardcore hiscore compare to their ironman hiscore (Screenshot names but first letter is censored to avoid players getting pms since it seemed like a system issue, I think I can get an uncensored if needed).
There is no reason to be lower runescore on ironman than hardcore ironman, at least not by more than 20-ish points. Please do note they can have accumulated far MORE runescore as a normal ironman than whats possible by the time of their hardcore death, as the player that died as hardcore with 69 total levels shows in the screenshot. Even 2k runescore is unlikely or impossible by that total level.
Here is a previous thread I made, some comments have interesting claims about why its broken, claiming they pull another players data on hardcore death.
I checked the top 100 and all but one had significant discripiancies from the ironman hiscore, most had 5-6 times as much runescore as hardcore than as ironman if not more and that is just impossible.
This is the hiscore in question
Thank you Hooli for responding.