This relates to multiple torrents that share content from a single folder/location.
To replicate:
1] Make folder (Testa7)
2] add a file to folder
3] make a torrent from folder
4] repeat steps 2 and 3 one of more times.
rename all torrents to Testa7
allow merge as needed.
When done, you should have 1 content folder and several torrent metadata files that point to that single folder location.
Check that everything is insync, iow that all files are physically located in the same folder.
If you created say 5 torrents, each with a different number of files from that folder, select them all and move them to another location.
Several errors will occur in that process. Repeating the move command and allowing Merge repeatedly will eventually result in a successful move.