Comment #2 on issue 837 by google....@ben.coman.com.au: ROCircle not constrained to equal dimensions http://code.google.com/p/moose-technology/issues/detail?id=837
Less a complaint :) and more a nitpick observation. You could just change it to ROEllipse and be done; or draw a circle within the minimum extent dimension; or grow element to equal sides of the maximum dimension as I've done above; or just ignore it. Low priority.