The 30 points aren't automatically awarded just because you studied in Canada.
For Canadian education, the CRS points depend on the
length/type of the eligible Canadian study program. For example, a qualifying Canadian credential of
1–2 years can receive 15 additional CRS points, while a qualifying program of
3 years or longer can receive 30 points.
There are also specific eligibility conditions, so it's worth checking the details rather than assuming a Canadian credential automatically gives 30 points.
You can also enter your education details into a
CRS calculator to see how the education factor affects your overall score:
https://crscalcu.ca/
If you tell me
what Canadian program you completed, its duration, and whether you have another Canadian credential, I can help you understand why you're getting 15 instead of 30.