I have some Table of  `{x,y,z}` values (energy as a function of 
radial and azimuthal frequencies in a galaxy if you care to know):

    dat = Import["https://dl.dropboxusercontent.com/u/659996/odd-data.m"];
    
If I plot the position of the `{x,y}`

    pl1 = Most /@ Flatten[dat, 1] // ListPlot
    
I get this

![Mathematica graphics](https://i.sstatic.net/dtS2f.png)

Note that there is nothing pathological in the distribution of points as seen 
from this 3D view

    Map[{Hue[#[[3]]], Point[#]} &, Flatten[dat, 1]] // Graphics3D

![Mathematica graphics](https://i.sstatic.net/mP2wC.png)

If I now plot contours of `z[x,y]`, I get that:

    pl2 = ListContourPlot[Flatten[dat, 1], PlotLegends -> Automatic,PlotRange -> All]

![Mathematica graphics](https://i.sstatic.net/uCy63.png)

**PROBLEM**

Now the puzzling fact is that it seems mathematica gives me contours 
at values of `{x,y}` which I have not sampled. 
This is best seen in the superposition:

    
    Show[pl2, pl1]

![Mathematica graphics](https://i.sstatic.net/DM4bH.png)

e.g. for values of `x=0.3 y=0.175`.

**QUESTION**
 
> Is this a bug?

or am I missing something obvious?