Why does 1 mail database failover

We have 2 Exchange 2013 servers in a DAG, each server hosts 3 databases. 5 of the 6 databases have copies on both servers, the 6th is a test one which we do not want to replicate.
One of the databases keeps failing over to the other server, it lists it's usual host server as its preferred server and the passive copy as its second choice yet it repeatedly goes into failover while the others remain on their host as they should.
The databases are all pretty close to the same size with the same number of mailboxes.
Does anyone have any idea what could be causing this?

Looking through event logs, the only error I see is this, found in
Application and Services Logs > Microsoft> Exchange > HighAvailability > Operational
An error occurred while trying to select database copy 'Database' on server 'server.domain.com' for possible activation. The following checks were run: 'IsHealthyOrDisconnected, IsCatalogStatusHealthy,
CopyQueueLength, ReplayQueueLength, IsPassiveCopy, IsSeedingSource, TotalQueueLengthMaxAllowed, ManagedAvailabilityAllHealthy, ActivationEnabled, MaxActivesUnderPreferredLimit'. Error: Database 'datsbase' is already hosted on target server 'server'.
Just before this was an information event saying it was initiating the move, no explanation why, no events for 30 minutes before this.

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Why does 1 mail database failover

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