Stolen Power created Wildwood circles which then created the shattered parts again in hand after playing

My opponent as a Rogue played Stolen power, got the druid shattered card Wildwood Circle combined, then played it with a soldier of sinestra on his board, then the Wildwood circle reappeared in his hand now shattered. I believe it shouldn’t work like that as when I played Stolen Power with Rogue myself the combined shatter card didn’t reapper in my hand shattered. I am not sure if it’s because the soldier was on board or only wildwood circle is affected this way.