So far with the previous years posts I have analyzed there can be because of the following reasons why you have been called for interview.
1. Random checks, as per their norms.
2. If they have some serious concerns regarding your any documents like eduction or job duties etc, where they want to give you second chance to explain your self before they announce DM, so that they can use 'Substituted elevation' as per their manual. If you are less with 67 points as per VO calculation.
3. If you just score 67 points as per VO calculations, They would like to see how well you are prepared, what you know and think about Canada, will you be able to survive in Canada in crunch situations like if you don't get job, what you will do etc.
These are just my personal views, what you people think.
read the above post from ---- nkarla.
could anyone please share your views on this. as it seems to be very disappointing one, if the VO already has a negative opinion with having just the 67 point mark and calling for an interview.