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.

On May 1st I had the misfortune to have a large position liquidated in September BTC/USD multi-collateral futures on Kraken. The markets (looking also at other relevant term, spot and perpetual markets) were very quiet, and I found out that the reason was a volatile behavior of Kraken's mark price. The mark price follows the midpoint of the bid/ask spread. At some point the market makers stopped quoting, the bid/ask spread became almost 30% wide and the mark price plunged by more than 10% in two minutes causing my liquidation.

I wonder if people had similar experiences on Kraken. While it is not a pleasant subject to discuss for anyone affected, if enough people come together, we may be able to exert some pressure on Kraken to compensate losses and improve their mark price methodology.