Random dust given?

I logged in and got a random 2400 dust as soon as a opened the client 1200 and 1200 like a reward was given, i wonder why and hope im not the only one is it from twitch drops or something?

You probably disenchanted something that should have given you more dust at the time. It’s happened a few times recently that cards were not giving the proper amount

I had this as well. The signature version of Skyla can be disenchanted now. This was not possible this week and just showed an error message.

when they noticed that nerfed signature cards was giving incorrect dust refunds they blocked the disenchant to prevent other players doing that.
But for players that disenchanted before the block , now they give the remaining dust amount.