Dedup store holding old information and not releasing free space

Hello 

We are using BE2012 sp4 with latest hotfixes. We have 1 central admin server and 1 Managed Backup Exec server. We are facing some problem with the dedup folder on MMS server which is still holding the old information which should have cleared via DLM. PLease check the screenshot attached and let us know how to clear those old files from the dedup store so that it can increase the free disk space. 

THank you