Point source (coax drivers), great on axis, smooth polar, and overall power response (what
@everettT said, favorable interaction with local acoustics)...the KEFs ought to image like champs, especially compared to Scalas in such a small space.
Because of imaging? If so, that indicates a miscalibrated crossover between the sub and the KEFs (no trivial task to pull off). Get it right and it should be seamless and unobtrusive, but get it wrong and you'll get glaring audible tells that wreak havoc with the overall results.
Then again, the KEFs probably extend deep enough to not require subs for strictly music listening.