IOM linking gift to non constituent

We use the Luminate Online Importomatic connector to pull gifts into git batches in RE. This week the IOM import profiles have started matching incoming gifts to non constituent relationships on constituent records. Like, not flagging them up and saying "is this a match" and giving us the option to promote them to constituents - but matching them in the batch so that it is trying to hard credit a non constituent. 

Has anyone else experienced this and how did you stop it? 

I didn't even know this was possible!