payroll issue

dear gurus,

i am facing in the payslip.

i am running the payroll for the month of jan 2011 01.10.2010, it is working fine.in simulation. the total amount is coming as 16,450. when i run the simulation for the month of feb 2011 01.11.2010, the amount is showing as 16,450.and in deductions part it is coming as mentioned below.

E PF Contribution as 1116

Prof tax split period as 110

Intern.Ded.Carry fwd as 110

why in 01.02.2011 to 28.02.2011 it is showing Intern ded carry fwd as 110.00

when i run the simulation for the month of mar 2011 01.12.2010,the amount is showing as 41,000etc.when i observe the payslip it is taking again basic and some allowance once again in payslip.why it is taking?in deductions part it is showing as mentioned below

E PF Contribution as 1116

Prof tax split period as 110

CF PF Monthly as 2192

ptax deuction carry fwd as 220