Download history missing

[keeniv]

HI I have been using bitcomet for years.  Recently after shutting down the computer and returning to bitcomet to continue downloading, all of the download history goes missing.  It is not in the download folder or appdata or anywhere.  So I tried redownloading the torrent and there notify that the task already exist, however I cant find it in my computer path as well.

Any idea what happened, how to resolve this? Thank you