
I would need the full log and then try this myself with full debug logging, otherwise I can only give you my best educated guess.
1.
According to TheTVDB,
Chicago P.D. only has 4 seasons, but FileBot is confronted with S05E18, so nothing makes sense anymore, the world breaks down, and FileBot will just go and pick the next best result.
@see
http://thetvdb.com/?tab=seasonall&id=269641&lid=7
2.
If you want FileBot to remap the SxE numbers, like matching 5x18 to 4x18, then I recommend using an age filter. There's pros and cons to that though. See amc manual for details.