That sounds like they're placed correctly. But it conflicts with your later
description of "feeling cross-eyed".

To address one of your questions - no, you can't induce esotropia in a
visually healthy adult simply by maladjusting an instrument.

Another question - the tubes _should_ be displaced a little medially because
you converge to the "near PD" when aligned for an object distance of 40-50
cm. Eyeglasses made for near are similarly displaced. Also, the two barrels
shouldn't be exactly parallel, rather pointing at the object of regard like
the legs of an isosceles  triangle.

The third question - did they screw up - probably not. As long as you get
clear, simultaneous binocular vision with each eye, they have to be close.
The exit pupils of these scopes are fairly small and unforgiving, like
binoculars. Think how finicky binoculars are, when adjusting the pupil
distance - it's too easy to cut one eye off. When they're lined up properly,
the circular fields for each eye are superimposed. When they're off just a
little, you can't view simultaneously.

If they're uncomfortable and you're going to spend considerable time using
them, you can have them redone. If they don't hurt and you get good stereo
vision, the manufacturer won't see a reason to remake them.

-MT