I suspect the 5 provinces, BC, AB, SK, ON and QC had situations in which they were opening up while the delta variant was getting a strong foothold.
NS, NL, PEI, NB, MB, NU, NT and YU didn't see spikes.
COVID-19 daily epidemiology update - Canada.ca
If government officials had listened to the people who voted for them, they would not have made such big mistakes. Trudeau led the way, to some degree, by declaring the borders open. I'm convinced that he made the decision for personal political reasons, since it coincided with announcing an early election.