It's just impossible to use it.
90% of time it refuses orders, sometimes refused orders suddenly somehow becomes accepted.
So double-triple-sell/buy should not surprise you when you work with kraken.
Sometimes when you need to sell or buy right now - you just can't and loose moment.

We are migrating from kraken.


UPD. Anyway I hope they could fix it and we can continue use it, because in other senses it has its strong advantages.