Hello, I have a very weird issue with Solidworks since I'm learning advanced surfacing. 

Here is the context: I am modeling the body of a car, so I have projected curves and 3D Sketches that I use in order to create boundary surfaces. 

But sometimes when I create a 3D Sketch and try to snap it on an edge, it doesn't snap correctly. I must zoom in to the maximum to figure out the issue, so it took me