Incidence across calendar year

[Naa Naadu]

I have a dataset where I want to calculate incidence by age groups across the calender years
The command I used was:

stset censor, failure(event==1) exit(end) enter(start) id(id) scale(365.25) origin(dob)
stsplit agegroup, at(0(10) 80)

preserve
keep if agecat==0
stset censor, failure(event==1) exit(end enter(start) id(id) scale(365.25)
stsplit calyear, at(40(1)60)
gen calendar_yr= calyear+1960
strate calendar_yr, per (100000)
restore


preserve
keep if agecat==10
stset censor, failure(event==1) exit(end) enter(start) id(id) scale(365.25)
stsplit calyear, at(40(1)60)
gen calendar_yr= calyear+1960
strate calendar_yr, per (100000)
restore


I repeated this for the rest of the age groups.

These codes increased the person-years and gave me wrong incidence.

How do I resolve this? I have attached an example dataset


id event censor start end dob
12. 1. 12/12/2011. 01/01/2010 01/01/2020 07/08/1993
13. 1. 12/12/2014. 07/02/2011 02/02/2019. 01/03/2005
14. 0. 12/04/2011. 06/03/2010 03/03/2018. 02/07/2002
15. 1. 12/08/2012. 05/04/2012 06/04/2017. 03/03/1990
16. 1. 12/12/2011. 04/05/2013 07/05/2016. 04/03/2003
17. 0. 12/09/2013. 03/06/2014 08/06/2016. 05/04/1996
18. 1. 12/12/2011. 01/07/2015 09/07/2019. 06/05/2002
19. 0. 12/12/2011. 08/01/2010 11/08/2020 07/06/2001

Thank you very much