Yeah, it doesn't look promising
It seems like the EE system doesn't allocate points for 'Study in Canada' and 'relatives' which is 30 and 15 points respectively. This makes a total loss of 45 points when compared to the CRS calculator tool.
Assuming they only consider your relatives to be siblings which I don't have but an Aunt who is a citizen, I should accumulate at least 483 points.
But the main issue comes down to me not getting those 30 points for my Canadian study. I have double-checked all the data entered for my application and CRS calculator and I can't find any errors.