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

guru's please provide your valuable inputs in this issue on priority