My list of unfinised download are gone

When i restarted the device or i restarted the application, my list of unfinised entire download are gone. Sometimes it only left one or two finished download, the others is gone.
All my device, behavior like this.
I think this is a bug. This happen almost entire update when you switch ttorrent pro to ttorrent no add.
This is never happen on ttorrent pro.
I use the newest update from playstore right now.
Please fix this? Or i have to change to another torrent client, because this bug is very annoying.

Thank you