Norton Internet Security Full System Scan Number Of Scanned Items Differs?

Hello guys. I was wondering why I keep on getting different number of scanned items when I do a full system scan.
First I decided to do a scan.
Capture.JPG
As you can see it scanned 1,461,888

Then I noticed other scan results only having 200k + so after a few minutes( 16 min.) I decided to do another one.

Capture1.JPG
As you can see it only scanned 223,807 and it took less time.

Out of curiosity I deided to do a few more and all of those returned something between 210,000 - 223,000.  ALL SETTINGS ARE DEFAULT. I just have 2 questions guys:
Is this a bad thing?
What should I do about this.


I forgot to say that my other scan results before these also gave me 1,400,000 +