It’s probably your current landlord
From time to time, property managers re-check renters’ report with SafeRent. Private landlords don’t usually do that, but property managers tend to do a re-check when the lease is up and it’s time to renew it.
Just to be sure, drop by the management office and check with them. If they didn’t re-check, then someone else is using your information to try to get an apartment.
Most identity theft cases are done by someone close to you such as a family member. Look carefully into the matter until it is resolved. You can find some useful information about identity theft recovery and prevention here.