Hi Lestatdelc, that's just a display artifact that should be ignored.

There is a setting under Options > View > Meshing parameters > "Mesh angle" that you can tighten up to reduce it but I don't recommend that because it will greatly increase mesh density in other areas and can bog things down when you have larger models.

More information here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10580.2

- Michael