Missing Episodes: The X-Files

Hi there,

I got drawn into watching the X-Files from the beginning and noticed a glitches...
Could you possibly check for these:

Series 2 - Episode 4 (Sleepless): missing episode
Series 7 - Episode 1 (The Sixth Extinction 1) and Episode 2 (The Sixth Extinction 2): one of those is listed and the other is missing, but it's not clear which is which as they have similar titles...
Series 9 - Episode 19 (The Truth 1): listed at the end of series 1...

As always, thanks for your help