I was buying the four missing pumpkins from my collection and I took just enough SP from my currencies to buy all of them. Three of them went fine, but the fourth gave an error: You don't have enough SP to buy that item. I was trying to buy 'Kora Carved Pumpkin' for 1000 SP, with 1000 SP on me. I tried a different store for 1000 SP, but the same thing happend. After I withdrew another 50 SP from my currencies it worked (buying it for 1000).

Anyone had the same thing? First time I ever got this. My system: Windows 8.1 using Firefox 41.0.2

No, I guess it was a single time bug since I haven't experienced it again.