[Idiom] "not in the same place twice"

[maiabulela]

A man says "I know where is the ultimate treasure, but it's on an island that is never in te same place twice, The Vanishing Isle"

What is the meaning here of " that is not in the same place twice"?

Thanks.

 

[mmasny]

It means that every time someone sees it it's in a place different from the places in which it was seen before.
I am not a teacher.

 

[Barb_D]

Also, "I know where the ultimate treasure IS," not "where IS the ultimate treasure."