Two Lines Generates F-53 with Same Posting Key

Hi

There is 6 Miro in Open Line item. Now I have paid it through T code F-53. When i simulate the Document of F-53. System gave me Line item as Under

50 Bank Account Cr 6,078,211.00-

25 Vendor Account Dr 2,606,924.00

25 Vendor Account Dr 3,471,237.00

My Question is Why System Gives 2 Line. I have Check all 6 Open Item in System it for same Business area.

Mann