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There are three ways I know of to get this many boosters. It's not indefinite boosters, as these would have the indefinite sign that we get when King grant us half an hours worth free boosters. 99 means this player has more than 100 of this kind of booster.
Hello @sararich you have probably seen other posts on this subject by now, but the stuck avatar issue seems to be a widespread issue amongst some iOS users. It is plainly a problem that only King can resolve, but as it appears they have all finished for Christmas everyone affected by this issue will have to wait until next year before their game gets fixed.
If you haven't done so already please try replaying and winning the level at which your avatar is stuck at. Also if there are any levels after that level without a number being displayed please replay and win them as well. In the past this method of replaying levels has helped to unstick the avatar.