'cause it sez so...
Note that broker ads always have a lot of ''boiler plate" explaining they are only stating what the owner told them and that they can take NO responsibility for the description.
Sometimes the owner's info is not factual -- mostly thru errors, one should charitably assume.
And, it might actually be a taller rig, either from the factory or something a PO did. Tape measure will tell the tale, along with many other bits of information that come out of a survey.
Best,
Loren