A few years ago I used to record "Lost in Space" because it aired so late. One Saturday, the episode "Target Earth" aired for about 30 minutes and after a commercial break, ended wth the second half of the "Time Merchant".
I solved the problem with the purchase of the Bluray box set.
Yeah, METV does such a horrible hack-job on their episodes to fit in commercials, it's amazing how much they cut. Could be they are splicing some shows back together wrong. They (Perry Mason for sure) aren't wrong on the dvd's, and better watching also.
This type of thing isn't as rare as some might think happened on History with an episode of Ice Road Truckers. Last segment was from a different episode. Have seen it on TV Land with Everybody Loves Raymond, and on Decades at least twice.