I don't know what HearthSim or Joust are, so I hope this is the right place for HSReplay bug reports.
I turned the Event Log on for one of my replays, hoping it might clarify what happened in a match I just had (it didn't, but not why I'm here).
I'm noticing that it constantly says {Player Name} "steals" {Card Name} where it is describing another keyword entirely (draw, discover, play, summon, etc.}
It's more of a nuisance than a problem, since it's obvious on board what's going on. But, I thought it would be worth mentioning.