Q:

Interpolation producing weird result QGIS

I have some points I want to interpolate. 
Output:

Anybody got a good idea on this one?

A:

One possible method would be to reproject your point layer from the EPSG:4326 to a UTM CRS instead. Ofcourse, you would need to reconfigure the settings to satisfy your CRS units instead of using degrees.
Another method (which worked for me) was to use the latest QGIS version (e.g. QGIS 2.18) as personally, I had issues with interpolating point layers which used the CRS EPSG:4326.

