Bug on event shop

[next trout]

Bug: sometimes if u buy memory on event shop, when u buy 2 memory u will only get 1
Just happen for me when I buy Chaterine on event shop the cost was 800+ for 2 but i only got 1 Chaterine memories
Of course my currency got reduce

I only can give my currency even shop for evidence.

Stupid of me using the memory first before i screenshot it

Please admin check it on my history account items or something for more evidence.