Migrated Files/Folder Size isn't Matching with Windows Folder Properties
Summary: Migrated Folder Size is not Matching with Windows Folder Properties.
Symptoms
This article provides information for why migrated folder count and size are not matching when viewed on the windows folder properties.
Migrated Folder Size is not Matching with Windows Folder Properties
When you are migrating data from one computer to another computer, in certain cases, you found that after migration, the file count for a selected folder might vary by a small margin of 1 or 2 files between source computer(see Figure.1) and the target computer(see Figure.2).

Figure.1 Source PC Figure.2 Target PC
This is a common Windows file properties issue and has nothing to do with the file migration feature. All your files and folders are copied unless the skipped files are listed as part of the migration summary report.
Resolution
This can be verified by listing the files under the folders under question as per the steps provided below:
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Search command prompt in windows search and launch "Command Prompt".
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Run directory listing for migrated folders to create output in a file.
Enter Dir path(destination folder address) in the command prompt screen, then Enter
You can display details of the current folder file name, file size, etc. At this point, you can compare the size of the folder called out by command to the size you saw on your old computer before the migration. (see Figure.3)
Figure.3 Command
To save the information on this page, enter the following directly in the command prompt:
Dir path >s >w > Destination_folder_address\name.txt Enter(see Figure.4)

Figure.4 Dir