Torrents Dissappear but still download

[Brendan]

Good day,

Hope someone can help, Im running BitTorrent 7.6.

There are times when Im downloading multiple torrents simultaneaously, lets say 6, and when most are finished i delete them from BitTorrent. Sometimes when I do this the remaining torrents become invisible in the window. I can still see they are downloading in the left hand tool bar but the name of the torrent, progress and download speed etc dissappear, this only happens when I delete SOME torrents from a list of multiple torrents.

Hoping someone can advise on how to avoid this or alternatively if it does happen how to make the torrents that are still downloading visible again.