For everyone who thinks this was poor planing you are looking on it wrong way. After all recent stuff i saw in game i am pretty sure this was for reason. You just have to look it form the right way.
1. Give them double drops so ppl would spend money on crystal refreshes.
2. Now most ppl used a lot of crystals on refreshes and have their reserves exhausted, what to do to give them initiative to keep spending?
3. Increase hard node attempts for limited time to give them feeling that if they spend now they get more than if they wait.
4. Profit.
See it is perfectly planned thing. This game is cash-grab after all.