File not moving to season folder

Sonarr version (exact version):
Version
2.0.0.5338

Mono version (if Sonarr is not running on Windows):
Mono Version
6.4.0.198
OS: PRETTY_NAME=“Ubuntu 16.04.6 LTS”
Debug logs:Logs here
Description of issue:
Sonarr failed to move files into the season folder after download. The files in history still show as downloading and never complete

see here

Looks like Sonarr is only seeing samples, not valid video files.

19-11-30 23:54:10.0|Debug|DetectSample|[/home/user/Downloads/unsorted/Fresh.Off.the.Boat.S02E12.HDTV.x264-KILLERS/Sample/sample-fresh.off.the.boat.s02e12.hdtv.x264-killers.mp4] appears to be a sample. Runtime: 00:00:59.9750000 seconds. Expected at least: 300 seconds

(repeated for the few examples I checked)