That would be my guess. For instance, the original Law and Order used to be segmented depending on the channel. One channel had the rights to the first couple of seasons. Another channel could show the later seasons. And another could show them all.
There are also shows I watch on streaming from other countries where Season 1 is actually the third or fourth season of a show because they don't have the rights, for whatever reason, for the earlier seasons. It's weird.