I updated AdminTools 3.7.1 on few sites and I noticed that thing.
The procedure was that:
Scan for file change - no change, OK
Install update from disk (package) (from 3.6.8 to 3.7.1)
Scan for file change
And now on few site file scanner shows 12 new files, on few sites shows 6 new files.
I check that and result was that:
12 new files
administrator/components/com_admintools/engine/Filter/Stack/StackHoststats.php
administrator/components/com_admintools/views/schedule/view.html.php
administrator/components/com_admintools/views/schedule/tmpl/form.php
components/com_admintools/controllers/filescanner.php
administrator/components/com_admintools/controllers/schedule.php
administrator/components/com_admintools/models/schedules.php
administrator/components/com_admintools/engine/Util/Buffer.php
administrator/components/com_admintools/engine/Util/Complexify.php
administrator/components/com_admintools/engine/Util/Transfer/Ftp.php
administrator/components/com_admintools/engine/Util/Transfer/TransferInterface.php
administrator/components/com_admintools/engine/Util/Transfer/Sftp.php
administrator/components/com_admintools/engine/Filter/Stack/StackErrorlogs.php
---
6 new files
administrator/components/com_admintools/engine/Util/Buffer.php
administrator/components/com_admintools/engine/Util/Complexify.php
administrator/components/com_admintools/engine/Util/Transfer/Ftp.php
administrator/components/com_admintools/engine/Util/Transfer/TransferInterface.php
administrator/components/com_admintools/engine/Util/Transfer/Sftp.php
administrator/components/com_admintools/engine/Filter/Stack/StackErrorlogs.php
but these files
administrator/components/com_admintools/engine/Util/Buffer.php
administrator/components/com_admintools/engine/Util/Complexify.php
administrator/components/com_admintools/engine/Util/Transfer/Ftp.php
administrator/components/com_admintools/engine/Util/Transfer/TransferInterface.php
administrator/components/com_admintools/engine/Util/Transfer/Sftp.php
administrator/components/com_admintools/engine/Filter/Stack/StackErrorlogs.php
was marked as modified and uploaded on server like files 12 new.
I think there is everything OK, but I would like to send this behaviour to You.
Regards