Casual Leave Is not Getting Deducted from Casual leave Quota

Dear Guru's,

I have Facing an Issues, I dont know whether I can call it as Issue.

For some Employees Casual Leave is not getting Deducted from Casual leave Quota.

I have Checked all the groupings and Config and Cross verified in Dev and PRD everything is fine.. and even created test data in Dev and it is working Perfectly ..

need your Suggestions to solve this.

Please have a look it below Screen shots and Help me on this.

Below is the Screen Shot for IT2001 and Casual leaves are highlighted in Yellow Colour.

Below is the Screen Shot for IT2006..Employee has applied 5 Casual leaves But in deduction Period it is showing 0.

Need your Expert solution to overcome this.