^^ Yes, titles frequently change. Tales of the Gold Monkey
was originally Tales of the Brass Monkey
. The Night Stalker
changed to Kolchak: The Night Stalker
in mid season. Baa Baa, Black Sheep
changed to Black Sheep Squadron
between seasons. Charlie's Angels
was originally The Alley Cats
. Hart To Hart
was originally Double Twist
. The Outer Limits
was originally Please Stand By
. Give me a couple of minutes and I could probably think of a hundred more.
Here's my answer, however wrong it may be.
It's very wrong. You clearly have no idea how many writers, including myself, have multiple untitled WIPs in their files at any given time.