question about tenant rights and lease duration

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Hello, i currently own a student rental in Kingston Ontario, renting to university students. i'm using a property manager to manage the lease/maintenance, as i reside elsewhere.

the property is currently leased to a group of 4 students, from May 2019-April 2020. as of right now, the students have not committed to another 1-year lease (May2020-April2021). i asked my property manager to secure another 1 year lease, either with this group, or with another group.

however, the property manager told me that the students have decided to continue on a month-to-month basis. as in, i can't force them to leave when their lease expires (May 1st 2020) in order to make room for another group of students.

i'm a little mad because this screws up the leasing schedule for student rentals, students typically sign for 1-year periods starting in may and ending in april the subsequent year. 

my question is, is the property manager correct in saying that if the students decide to continue month-to-month, i can't kick them out when their lease expires? it seems a bit unfair to the landlord, after all, they signed a 1-year lease so unless they resign, i feel like i should be allowed to kick them out (thats just my opinion though obviously).

thanks!