The number one reason we have for refusals from the region is the proof of funds. We require that people demonstrate that they have the capacity to support themselves when they're here, because we don't like to see students become destitute in Canada. It's something we want to protect against.
It's a challenging when you see that certain regions have lower acceptance rates in the system, because you don't like to treat one group differently from the other. That's the number one reason we see for why a person may be rejected from the region.
However, the numbers are similar year-to-year between anglophones and francophones. There's an issue that you're raising, but it's not necessarily one based on linguistics.