firewall – Iptables limit flag flag

I've tried adding an iptable rule

sudo iptables -A COUNTER -m limit -n - limit 1024 / sec - burst limit 1024 -j ACCEPT

But when I try to see the rules using iptables-save -c or iptables -nvxL, the output is

-A COUNTER -m limit - limit 1111 / s - limit-burst 1024 -j ACCEPT

I can not understand how the 1024 / s is translated to 1111 / sec

I've tried with other limits as well and few limits have been changed. Someone can explain what's going on

Similarly if I try with 900 / sec, it is translated to 909 / sec