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Camera distortion estimation, and calibration for that matter, involves solving high dimensional non linear minimization problem that is quite sensitive to the input data. Looking at your values, I would say that they vary within a reasonable margin. In your case the radial distortion model with higher order coefficients, here you have coefficients for the r^2, r^4 and r^6 terms, is an overparametrization for the distortion of your lens. Because you can achieve similar reprojection errors with distortion parameters varying by up to an order of magnitude strongly indicates this model has too many degrees of freedom.
In general I would not worry too much about varying distortion and calibration parameters as long as the rectified image does not have visible distortion and the reprojection error remains low.
