multiple port scans

Using Nessus 3.0.4 to scan 5 machines, in the scan output that is sent 
back while the scan is running, I see 4 blocks of portscans scanning the 
same ports, so port 1234 here...wait a bit, then port 1234 again...wait 
a bit, etc. Is this expected behavior? Here's my scanner set.

begin(SCANNER_SET)
 10180 = no
 10278 = no
 10331 = no
 10335 = yes
 10841 = no
 10336 = no
 10796 = no
 11219 = no
 14259 = no
 14272 = no
 14274 = no
 14663 = no
 11840 = no
end(SCANNER_SET)


Do those plugins also need to be set to "no" in the plugin set? And why 
are some of those plugins, like 10278, even included in the scanner set? 
Searching on nessus.org shows that plugin to be Sendmail 8.6.9 ident 
overflow check.

Thanks in advance,
Tim
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