You don't have enough cash

Except I do.
I wanted to buy one red leaf high key with the left overs of my skill books/cloths but apparently I can't.
I have exactly 400nx so I don't get the problem. Is it because I use nx credit?
But it's the same with maple points: they gave me 99 so I tried to buy one of those event things to get the same message "Not enough cash".

 Am I missing something or am I bugged?

My boyfriend has the same problem, tried to buy the box to motivate him to play more but he couldn't >_>

Yeah, my friend tried buying a Royal Hair Coupon with exactly 3.3k nx. Guessing you'll need 1nx more than what you're about to spend.

That's just stupid. Key things not so much, I'll just charge 5k and buy some whenever I can.
But why give 99 maple points if you can't use them?

Because Nexon's programmers can't tell the difference between ">" and ">="....

It got fixed.