Can't believe we've been told to write a positive review... - Store Manager BrightHouse Employee Review

We received an email today from HR asking us as Bridgeheads (senior managers) to all write in telling GlassDoor our positive feelings about BH! Unbelievable! They have sent an email (copy available for Glass Door if you want to see?) to the managers they think are happy - not to all? Why? Why not everyone? Doesn't take a genius - email says '' there have been a number of negative reviews recently'' so let's get behind sending some positive views to help people looking to work in the future - to me this is wrong?