Seinfeld episode numbering appears to be wrong

[Peter_H]

Twice in the last week, I have apparently been recording missing episodes of Seinfeld, but the episodes recorded have not matched your guide.  The upcoming episodes also appear to be different than other TV guides.
Sydney Channel 10 Peach using Plex
On 15/5 I recorded an episode labelled S06E03 The Pledge Drive, but what I got was S05E21 The Hamptons
On 19/5 I recorded an episode labelled S06E06 The Gymnast, but what I got was S06E02 The Big Salad
The next upcoming episode tonight (Fri 22/5) your XMLTV and online guides list S06E08 The Mom and Pop Store at 8pm, (and 10Play's own guide agrees with you) but ourguide.com.au lists this as "The Gymnast".  Time will tell if this is correct, but this would match up with the screened episodes being 4 episodes behind your guide, like the examples above, so it appears they know something that you and others don't!?