The density has increased, it's correct, but I think that there is some small mistake in your calculations. You are comparing different data.
You are comparing total cases of dv2014 wih only invited to co ones in 2015. It would be more correct to take final ceac for 2014 and compare invited family members to CN count in both cases.
Then it makes 24,570 (family members) / 11,064 = 2.22 (data taken from final dv 2014 ceac)
So yes, there is a density increase, but it is from 2.22 to 2.25 but not from 2.09 to 2.25 as you mention imho.