Transaction not displaying in "My Account" page, though balance is correct

[alphaBar]

I withdrew some BTSX from an exchange to my account. When I look at my account page the balance at the top of the page is correct, but on the bottom of the page where "recent transactions" are displayed the final balance is wrong and a single transaction is missing. I've made other withdrawals from the same exchange and they show up in the list. Any reason why a transaction would be absent from the list?