I have a question about lightspeed.stlsmo.sbc ????

I'm not sure what the question is.  If you look up 172.15.4.144, you will find an rDNS record:

144.4.15.172.in-addr.arpa    IN    PTR    172-15-4-144.lightspeed.stlsmo.sbcglobal.net    7200s

That's the reason the FQDN appears in reporting - the UTM looks up the rDNS record.

Does that answer your question?

Cheers - Bob

Not that the problem is that the FQDN of the computers is different for example ltopazpeda and so they appear several with traffic and with those names nose that could be

Today is trafficc 

If those are IPs that belong to you, you can ask sbcglobal.net to change the rDNS records to ones that point at your FQDNs.

Cheers - Bob