Ah, I noticed that the other day as well. I was waiting to report it after I completed Selenitic (to see whether it was reversed in both Ages or just Mechanical). If it's not reversed in Selenitic, then it's a straight bug and should be fixed.
Interesting... it reminds me of the bug in Myst: Masterpiece Edition (which is still present -- to this day) where the left side of the torn page tells you to turn all the marker switches to the "off" position, when it should say "on". It is impossible to complete Myst: Masterpiece Edition if you directly follow the (misleading) clues; you either need to guess that they are wrong, or cheat using the Internet. Thankfully that bug was corrected in realMyst.