If quotes are not displayed in your list, it may be that they have been automatically expired due to a setting. You can see them if you click on the 'expired' link at the top of the list.
The setting for when quotes automatically expire is in the settings screen as seen below:
Changing the 'Expire After Months' to a number above 0, will automatically move those quotes into the expired list so they don't appear in your regular list.