Retention tag to delete messages in Deleted items folder does not work as expected

I have Exchange 2010. I created new retention tag to delete messages older than 14 days in Deleted items folder. If I apply this policy, messages are taged to be deleted in 13 days. If I apply same tag to junk items, messages older than 14 days are deleted.
Why are not deleted messages older than 14 days in Deleted items folder?
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pospichalalesAsked:
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AustinComputerLabsCommented:
From: http://social.technet.microsoft.com/Forums/en/exchange2010/thread/7a2ff45d-4ab8-46b8-badf-62a8ead5fc57

Example when item is moved to DI from a folder with an RPT or DPT...

1.Item comes into Inbox on 1/24/2010 and Inbox has a DPT of 1095 days. The item is stamped by the MFA with a Start Date of 1/24/2010.
2.The item is deleted by a user on 3/15/2010 and moved to Deleted Items, which has a RPT of 30 days on it. The Start Date remains at 1/24/2010 because moves to DI don't re-evaluate/change the Start Date.
3.MFA comes around and scans the mailbox, sees the item in Deleted Items with a Start Date of 1/24.
4.Since 1/24 is >30 days it deletes the item.
Example when an item is moved to DI from a folder w/o a RPT or DPT...

1.Item comes into Inbox on 1/24/2010 and Inbox has no RPT/DPT. No Start Date is stamped, Start Date remains $Null.
2.The item is deleted by a user on 3/15/2010 and moved to Deleted Items, which has a RPT of 30 days on it. The Start Date remains $Null because moves to DI don't re-evaluate/change the Start Date.
3.MFA comes around and scans the mailbox, sees the item in Deleted Items with a Start Date of $Null so it uses "Present Date + RPT" instead.
4.Item has an expiration date of 3/15 + 30 days stamped on it.
5.Once MFA scan the mailbox on the 30th day after 3/15, it deletes the item from DI.

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pospichalalesAuthor Commented:
Thank you, I understand it. Can you explain me acronyms DI, DPT and RPT for completeness?
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AustinComputerLabsCommented:
DI Deleted Items
DPT Default Policy Tag
RPT Retension Policy Tag

DPT and RPT are often used interchangeably.
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pospichalalesAuthor Commented:
Thank you.
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