Are you sure the contents of the files are the same?
Normally you get these kind of files when you stop and restart auto import during the session.
PT3 only moves files when you stop auto import.
Given the file names I suspect that these files are being generated when you play at the same table more than once in the same day - the file names only have the date, table name and limit - there is no time information, so if you rejoin the same table later in the day after PT3 has moved the file from your first session a new file will be generated with the same filename.
When you stop auto import again next time and PT3 moves the second file it will find one already existing with the same name so it will append "_1" to avoid overwriting the previous file.
Please check the content of the files (in particular the times of the hands and hand numbers) and if they actually contain the same hands attach a few example files to a
Support ticket so that we can investigate.