Normal
The files are the timeshift buffer files that recycle themselves, they normally get deleted when the tvserver is finished using the card. If the files are still being read by a player when the card is released then they will remain but should be deleted when the TVserver uses the card again. If you pause a player that's using the buffer files then the number of buffer files will grow since the TVserver can't reuse the ones being read and thus increase the number of files to a pre-limit value.