I was digitizing soils in feature class. So i had set topology to polygons must not overlap and polygons must not be disjoint. After creating a few polygons manually, I started tracing Polygons, but the trace tool did not copy the lines exactly and some parts of the traced polygons were overlapping while others were disjoint. I tried changing the tolerance but i had no effect. I tried using auto complete polygon but the results were the same. The topology gave me a lot of errors and i had to manually join polygons and edit vertices of polygons.
I was using ArcGIS 10.2