Rostock moving steppers like a cartesian printer

So I've built all my frame and carriages and now I'm doing the wiring and firmware.
I have downloaded the Marlin firmware and set all the Delta parameters (arm length etc).
It's been uploaded to the RAMPS and I'm using Pronterface.
At this point I can get the machine to home but when I manually jog it or do a dry run of G code it doesn't move like a deltabot.
Instead of all the carriages moving to create the motion it is turning each stepper as if it was driving a cartesian axis.

Any ideas what I might have overlooked?

Line

#define DELTA

should not be commented out.

Compare you config to this one: [github.com]

I tried a couple of different configurations from Github.
This has fixed my issue.
Interestingly the line "#define DELTA" isn't in the file.
All the other DELTA variables are though.