Are you trying to re-use a bid group? Once you have won the number desired, remaning snipes are deleted. You should delete a bid group once you are finished with it, and create a new one for the next item(s) you want to win.
Delete a bid group:
Click My Snipes tab
Click Manage Bid Groups
Click the word 'delete' by the bidgroup.
Create a new bid group:
Click My Snipes tab
Click Manage Bid Groups
Enter Folder name (and discription if desired)
Choose Color
Make sure Bid Group Folder is checked
Enter the number of items you want to win
Click Create
Hang in there, it really does work!