Possible but highly unlikely. For the name brands, at least, quality control
has gotten pretty damn good after 100+ years. Much more likely that the wax
ring moved around while you were installing, or the flange ring on the floor
is slightly bent, or something got kicked under the edge before snugging the
bolts down. Spend the five bucks for a fresh wax ring, and take it out and
put it back in again, before you go trying to return the w.c. While you have
it off again, put a level and a straightedge on the flange and the floor, to
see if they are straight and level with each other, side-to-side, and
front-to-back. They do also sell shim kits for when things don't quite match
up, usually due to a floor that got wet at some point, and is now a little
off. (note that they can look fine to naked eye, and not feel mushy, and
still have a crown.)
Thanks. Good advice, but I haven't tried to set it yet. I pulled this
new Eljin bowl out of the box, set it on the floor and it rocked from
front to back. After flipping it upside down, a straightedge showed me
the part of the bowl that touches the floor is on two different planes.
From what you have said, I have to believe the bowl is miscast. Thanks
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