In the case the 2d section view of modeled formations appear to be of low quality or inconsistent with the data, the most common causes are:

  1. Interpolation parameterization is incorrect, see
  2. Plotting resolution is too low, see below

You may improve it by increasing the Number of Node in the Plotting Resolution section of the Plot the Model Settings window. 

It is highly advised to chose the same value for the u and v Directions.

For example, here is a series of snapshots of the same exact sections at different Plotting Resolutions: