Any items in the 'Limited' Section (basically includes limited apparels and any items that are part of a sale - such as the Flash one) have a cooldown before they can be bought again. (This cooldown is applied to everyone on the server per purchase, regardless of who purchased it). It's 3 hours I believe, and that item or package cannot be purchased until the cooldown is over.
However, some people tend to "camp" the good packages/items and either spam to buy them or time their purchase in the exact second and try to buy it then. This is probably what happened to you, seeing as how you got the timer again - someone was a bit quicker.
It is a bit annoying, but this cooldown feature was added because some people used to simply buy everything good on the event for themselves as soon as it went live and anyone who couldn't make it to the sale (due to timezone or whatever) had no chance to buy the limited stuff.
