How to read check stats

How does the files column work? Thank you so much for any help on this!

When I made the first backup, I had 38,951 files on the local disk (right click folders and then left click properties). I remember that it matched with the stats listed in the check at the time

Currently, I have 39,084 files but the backup stats is showing 39,053 files. What is the reason for the discrepancy?

     snap | rev |                          | files |    bytes | chunks |    bytes |  uniq |    bytes |   new |    bytes |
 snapshot |   1 | @ 2019-12-09 19:05 -hash | 38951 | 168,122M |  34036 | 163,721M |     8 |   8,351K | 34036 | 163,721M |
 snapshot |  27 | @ 2020-01-05 00:00       | 39053 | 168,416M |  34104 | 164,021M |     0 |        0 |     0 |        0 |

Looking at my logs, the discrepancy started with revision 2. Even with no changes, the number of files dropped by 31 files

2019-12-09 21:09:40.252 INFO BACKUP_END Backup for snapshot at revision 1 completed
2019-12-09 21:09:40.252 INFO BACKUP_STATS Files: 38951 total, 168,122M bytes; 38951 new, 168,122M bytes
2019-12-09 21:09:40.252 INFO BACKUP_STATS File chunks: 34511 total, 168,122M bytes; 34029 new, 165,998M bytes, 163,715M bytes uploaded
2019-12-09 21:09:40.252 INFO BACKUP_STATS Metadata chunks: 7 total, 15,139K bytes; 7 new, 15,139K bytes, 6,649K bytes uploaded
2019-12-09 21:09:40.252 INFO BACKUP_STATS All chunks: 34518 total, 168,137M bytes; 34036 new, 166,013M bytes, 163,721M bytes uploaded
2019-12-11 00:02:21.251 INFO BACKUP_END Backup for snapshot at revision 2 completed
2019-12-11 00:02:21.251 INFO BACKUP_STATS Files: 38920 total, 168,122M bytes; 0 new, 0 bytes
2019-12-11 00:02:21.251 INFO BACKUP_STATS File chunks: 34511 total, 168,122M bytes; 0 new, 0 bytes, 0 bytes uploaded
2019-12-11 00:02:21.251 INFO BACKUP_STATS Metadata chunks: 9 total, 15,139K bytes; 6 new, 12,608K bytes, 4,634K bytes uploaded
2019-12-11 00:02:21.251 INFO BACKUP_STATS All chunks: 34520 total, 168,137M bytes; 6 new, 12,608K bytes, 4,634K bytes uploaded
     snap | rev |                          | files |    bytes | chunks |    bytes |  uniq |    bytes |   new |    bytes |
 snapshot |   1 | @ 2019-12-09 19:05 -hash | 38951 | 168,122M |  34036 | 163,721M |     4 |   4,624K | 34036 | 163,721M |
 snapshot |   2 | @ 2019-12-11 00:00       | 38920 | 168,122M |  34038 | 163,721M |     6 |   4,634K |     6 |   4,634K |

The discrepancy is likely caused zero-byte files, which may not be counted correctly. See this issue: https://forum.duplicacy.com/t/backup-of-zero-byte-files