I can't quite picture what you mean, but if the bit was not equal in height above the table and in depth to the fence, that would have the effect of making the cross asymmetrical, with one direction of the cut being shallower than the other. A simple adjustment and a practice run on scrap would tell the tale.
I'm not slow, I'm pacing myself!
Isaiah 44:13 Another shapes wood, he extends a measuring line, he outlines it with red chalk. He works it with planes and outlines it with a compass...
Usual kit: Table saw, band saw, dual base router and table, lathe, various saws, planer, sanders, and a multitude of hand tools.