Hearthpwn

I gave Doppelgangster +4/+4 and cost 2 more in my run and the twins came without the bonus. 

That's really frustrating. There's been a couple things like that in the adventure that haven't made much sense. For example, the guy who gives you a coin and takes a copy of your minion (I think it was Gallywix) for some reason gets all the handbuffs or persistent buffs from the run on his copy despite that not being the case for any other copy effect in the game. That managed to cost me a run as I expected to be giving him a meh minion.

probably yes, since this is not the saronyte chaingang, surely a bug

Not because of dopplegangster..

Edit: I restarted game and it fixed. Don.t afraid to click quit ^^

Quote from WhatAChamp >>

That's really frustrating. There's been a couple things like that in the adventure that haven't made much sense. For example, the guy who gives you a coin and takes a copy of your minion (I think it was Gallywix) for some reason gets all the handbuffs or persistent buffs from the run on his copy despite that not being the case for any other copy effect in the game. That managed to cost me a run as I expected to be giving him a meh minion.

 That's exactly how such interactions work in the game though. Moving or copying to the same or forward in zones retains buffs.

I had the same issue with the +2/+2 buff. Popped it on doppelgängster and the copies were 2/2s and not 4/4s. Seems like a bug since this isnt like chain gang. Didn’t think to re-enter by quitting.

Definitely a bug. I think it might be to do with how they've coded the 'buff' they're giving the minion - whatever they're doing, it isn't a traditional buff. I definitely remember getting a minion with +2/+2 returned to my hand, for example, and it retained the +2/+2, which it shouldn't normally.

You can tell it's different visually, too - the 6/6 isn't green in the image, as it should be for a buffed minion.