@Robby36
Hosts are penalized for cancelling reservations, and a blocked calendar for the dates you cancelled is one of the penalties.
Have a look at the policy on this for the future:
https://www.airbnb.ca/help/article/990/as-a-host-what-penalties-apply-if-i-cancel-a-reservation-for-...
I see that your listing IS for an entire home. Did the guest book it in error? If so, and for future be sure to have the guest cancel, so that you're not accruing penalties for your guest's mistakes.