The team is already aware of this issue in some specific cases, and we are actively working to fix this.

In the meantime, please follow the sequence below, and make sure that you can squeeze all the earnings coming from boosters:

Try to travel between parks BEFORE you activate your boosters until the fix comes up. The game will save them correctly if you follow these two steps in this specific order.

OPEN THE GAME -> TRAVEL BETWEEN PARKS -> ACTIVATE THE DESIRED MULTIPLIERS.

If you follow the steps in this specific order, your boosters will be registered until they finish.