I bought the new potion "Potion XP" Item (5,250 Cash) several times.
I noticed that it doesn`t work.
I use the Potion XP and donate one EXP Boost that normally give 250 EXP.
The potion now should give me 750 EXP, because it says it multiply with x2.
Instead of 750 EXP I received 250 EXP.