The time stamps are correct BEFORE I drag and drop them (from root folder of same drive) into the Sync folder (of the same drive). But, after I drop them into the Sync folder, the modification time stamp changes to a future time stamp, which is why it has an error warning.
If I drag and drop the same file into a normal Windows 10 folder, there is not modification error. The error only occurs when dragging and dropping into a Sync folder.