Edge strip of finished render distorted/skewed

Hi Guys, First up sorry if this is in the wrong area I wasn’t sure where to put it.
Recently the last 5 images I’ve run, all separate files and models have come out with a strip down the right side that is heavily distorted and skewed (example below) Does anyone have any idea what this might be cause by?

Its got me completely stumped so hopefully someone has an idea. Thanks in advance!
Cheers, Hoz

i7-4790K @ 4.0GHz | Geforce 750Ti 2GB (Display) | Geforce 980 4GB (CUDA)

Please supply more useful info.

What settings are you using to render (even what renderer etc)
cpu or gpu rendering ?
Blender version etc
Please ALWAYS supply a demo blend file so all we have to do is press Render and we will see this effect