getting opening balance total worked - total payment =closingbalance

Question

I tried running total it is calculating over all ok but when i try to calculate for particular in between dated it giving wrong calculation even when i am subtracting 2 feilds of running sum its giving weong calulation

i am attaching my file for your reference to help

this is my first post hope it will be solved 

 

thanks

 

regards

preethi