Scan Changes Folder & File Dates

After either an Auto Scan or a Full System Scan, the dates and time of folders and archive files that BitDefender has scanned are changed to the date & time of the scan.

Is this supposed to happen? Is there a way to stop this?

There are now dozens of files (archive files--ZIP, RAR etc.) on my system that no longer show the original date.

Many thanks for your advice.