Interesting, I didn't know about those rules. I think I've ripped/ downloaded music which has been actually tagged artist - title, but I always rename the songs with just [title]. I've also received many tracks with the tag [name] in the format of xx - song title. Does tagging get messed up only if those numbers are at the end of the [name] tag? Again I always rename songs like that so the track number doesn't appear in the title/[name].
I think the specified auto-import rules have an impact (which the OP did not indicate what they were) on how well the auto-tagging works. I made an assumption based on the 2nd screenshot provided - the 2 problem files had the track numbers at the end of the filename. That said, if all the track names were initially constructed that way, but only those 2 did not import correctly, then something else is the issue.
I am not going to pretend I know exactly what goes into MC's auto-tagging, but to me it makes sense that the more things it has to try and "fuzzy" match, the more likely it will fail. I do think track numbers at the end of the name would present more of a problem than the beginning. Things like "live", "alternate take", "bonus" appended to the name can sometimes create issues too.