I asked this question three weeks ago and was told that you were looking into it. So far no answer:

Michelle-34

Why have all my flying saucer boosters disappeared while all the other boosters stayed intact?

I play the regular Candy Crush saga on an iphone and do not connect to facebook.  I had collected 4 flying saucer boosters that disappeared while all the other boosters remained.  What happened, and how can it be fixed?

Cezdiamond

Hi there!- Thanks for posting on King Care. I am really sorry that you have lost your boosters, I can understand your frustration. Please note that the boosters are saved to your device and not the game data, so you can use them when offline too. This does mean that any updates, crashes or device changes can cause these items to be lost.

For this reason we do not recommend storing too many of the won boosters as these can indeed be lost unlike Gold Bars.Let's make things right again so that you can all enjoy your sweet adventures!

I will send you all a private message so that I can check your account, please click on the envelope icon in the top right hand corner of your screen. As soon as you get back to me we can get this sorted :-)

Have a Candy Crushing week!