If this is actually happening -- which I imagine must be exceedingly rare given that Magic Reflect doesn't exist innately on any monsters, so it has to be a named boss which happens to get bonus Magic Reflect and then you have to get unlucky enough to get bounced by the, what, 2-5 points that it gets for being a boss? -- it could mean a giant mess for the devs. They might want to consider just disabling Magic Reflect on monsters altogether.