I am curious why? This leg that was squared in the planer has pencil
marks for clarity.

One side is perpendicular,
The other side is not. The blade comes up all the way thru and then
some, I use a high blade not just thru.

The way I rotate offers support on the backside.

Does anyone know why this is happening? I am getting tired of fixing
these after the fact.


Note that the lower picture as resized (or the upper one big) has the
taper perpendicular to the flat side of the leg. The upper one (lower
in big) has it perpendicular to the cut side of the leg, which makes
me think than that cut side of the leg is being used as a reference
for that cut. Either order the cuts so that does not happen, or make
like a cabriole leg and tape on the waste to shim the stock back to
roughly square before further cuts.

It looks to me like you are making at least one cut with an already
tapered leg resting on the table. The square top has to be the
reference for the fence AND the table, for every cut.