Splunk Search

Why does statistics from a tstats change while the search executes and at the end result is not complete?

Amarok
Observer

If I run the below search the statistics output changes while the search is progressing and when the search is completed not all results that was seen during the search is visible. 

| tstats summariesonly=f count from datamodel=Network_Traffic by All_Traffic.app,All_Traffic.src,All_Traffic.dest,All_Traffic.dest_port,All_Traffic.action
| lookup xxxx CIDR AS All_Traffic.src OUTPUT CIDR as cidr_ip2 fullzonename as sourcenetwork ZoneType as sourcezonetype
| lookup xxxx CIDR AS All_Traffic.dest OUTPUT fullzonename as destinationnetwork ZoneType as destinationzonetype
| where (cidrmatch(cidr_ip2,'All_Traffic.src'))
| search sourcezonetype="yyyy" AND destinationzonetype!="*zzzz"
| stats count by sourcenetwork sourcezonetype destinationnetwork destinationzonetype All_Traffic.action

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