Boosters disappeared

There are some glitches in Candy Crush due to connection problems and losing your win streak is one of them. Did you by chance close the app and then reopen the app before playing that particular level? Or maybe you lost the connection to the app store briefly and then when the game reloaded it did so without your win streak. I have had similar things happen to myself and since then am very careful to always do the following:

Whenever I open the app afresh I play an old, previously played level. I have too often noted that it takes one level played (any level, pass or fail, it does not matter) for the game to load properly and update itself to what events you should have, and that includes your win streak progress. In fact the added benefit of playing and failing an old level is that almost without fail I then get the gift of 3 extra moves (from "a friend") for my next level, which I can use then to play the next new level. Whenever I start a new level I check that I can see my candy chain on the pre level screen (see below). If I do, then my win streak boosters will show up in the level.

I know this won't help you now, but I hope it answers your question.