Pianoteq7 studio phasing issues?

My phase meter goes all over the place (I.e seems below the accepted phase readings) when using both piano (Steinway D) and especially Harp sounds. I've tried changing from Sound recording/Stereophonic/ and to Mono (obviously this does remove the phasing but is a less interesting sound) . However it doesn't sound phasey/bad, has anybody else noticed this or had a broadcast recording returned because of phase issues?