NS -- Two Odd Things

Windows 7 Pro + SP1 + updates
NS 22.9.4.8

Today I noticed two peculiar things.

1)  A quick scan at 9:39 a.m.  scanned   9,343 total items.
   A quick scan at 12:46 p.m. scanned 13,435 total items.
   That's a difference of 4,092 items.

No new software, or anything else, was installed.
Did not use the admin account for anything.
Only used a regular/limited user account.

2)  For each of the quick scans, when I actually added up the numbers shown under History --> Scan Results --> More Options, the total items scanned was _not_ the total that NS had told me.

Any explanations for these two things?
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6/8/2017  9:39 am

quick scan results
time 2:01
total items scanned          9,343  <----

more options

files & directories             5,782
registry entries                     600
process & startup items  2,363
network & browser items   590
other                                         8
trusted files                         578
skipped files                           0

  Actual total                     9,921   (+578)

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6/8/2017  12:46 pm

quick scan results
time 2:07
total items scanned       13,435  <----

more options

files & directories             6,374
registry entries                     600
process & startup items   5,863
network & browser items    590
other                                          8
trusted files                       1,138
skipped files                          95


  Actual total                   14,668   (+1,233)