This happens when the season/episode info is not included. When there is a pass rule
SeasonNumber < 5
it will match these episodes.
the solution(?) is to add SeasonNumber EXCLUDES 0 or SeasonNumber > 0
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This is a good tip. 
I figured out the same thing too and had to do it to filter out recordings with incomplete guide data (missing season and episode numbers) from Pluto TV or other sources.
I also include EpisodeNumber != 0 in my advanced passes, especially for programs on the Time-Warner-Discover-family of stations. They have a nasty habit of either not providing good metadata to Gracenote or creating a new version of the same episode and giving it a zero episode number.
Similarly, I also sometimes need to add Duration < 5400 (5400 seconds = 90 minutes, so you may need to adjust per program) because they'll take a couple of episodes and remix them into a two hour "special" that is really just old content. This setting stops those episodes from being recorded.