There is possibility that the effect is not immediately applied after purchase.
In that case, please try "opening then closing the Shop page".

-- EXP gain +30%
-- Item Drop Rate +30%

* After you have purchased all Monthly Tickets, please follow the steps below to add "Shortcuts" pages.
Tap "Menu" -> "Options" -> "Config" -> "Control" -> "Number of Shortcuts"
*"Item Stack Cap" is the maximum amount (cap) for each item you can own. Please understand that it does not expand the slots for Bag and Storage.

Please also refer to the Monthly Tickets page in the "Shop".