I am glad that in some cases the exchange was willing to make amends. In my case, I did some research to show that the mark price movement was not warranted by any market action. In its reply Kraken completely ignored this, and said that the leverage in my position was the only reason for the liquidation. Looking at the market data I know that this problem is pervasive at Kraken. I see other cases where mark price instability caused liquidations. But apparently, they want to ignore it.
future market provided by some exchanges in general are so full of inaccuracy, there are many exchanges that don't have accurate liquidation mark and as a result if you don't set SL and is really tight in margin funding you might get liquidate well above the supposed liquidation mark.
been to few crypto exchanges, all the same, at this point I think the fairest game is always with spot, since there's no such thing as liquidation they can't do something funny.