Dont worry about it.
nmap 127.0.0.1 - this would not show stealth ports, would show closed ports.
nmap -sS 127.0.0.1 - this would show stealth ports and closed ports.
nmap -Pn 127.0.0.1 this would show ports if you tried to block ping probes.
To sum up, if someone is trying to scan your ports, Closed or Stealth doesnt make a difference to someone who knows what they are doing.