Mirror unable to replace some files

[apesbrain]

Have used FFS for a long time. First time seeing this problem with 6.13. Trying to mirror my primary drive to a backup and some files are throwing an error saying they can't be moved to recycle bin on the backup drive. Changed from send to recycle bin to delete permanently and same problem. Highlighted the files on the backup drive and right-click delete: same problem. Only way to proceed is to open backup drive files in Explorer and delete them there. Then the mirror goes as it should. How can I avoid this problem in the future? Thanks.

[Zenju]

Can you post some screenshots and message, in particular the error messages you're seeing?