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"it's" ALWAYS means "it is" or "it has". Therefore, the title should be "its", which surprisingly is a word.

> "it's" ALWAYS means "it is"

No. It can also mean "it has", e.g.:

It's been 18 years since the turn of the century.

It’s not all that surprising if you think of “its” in the same vein as “his” and “hers”.

It does get weird when thinking of situations like Tom's, Ghostery's, mother's ...

It's dual of his and _her_; not of 'hers'. (In which form 'his' is unchanged.)