That sounds like a bug to me. You are supposed to just bounce on two flowers, so don't worry, you're not dumb.
As a matter of fact, I just went into the browser version of the game and tried it and it does seem to fail sometimes. :/
Sadly, all I can do now is to recommend downloaded version or to try to do it again a couple of times (if it always fails to bounce higher, then that's a serious problem).
Let me know how it goes, and thank you very much for bringing my attention to this.