New Hohner 270 C. 4 hole draw sounds wrong

Hello to everyone here.

My first post and I would be very grateful if someone can help me, please. I’m new to the chromatic and I’ve just purchase a new 270. I thought I would play the C major scale just to get things moving but the first thing I noticed was that hole 4 blow was fine but hole 4 draw sounded, at least to my ears, that it was going down in tone instead of up; holes 5 to 7 were fine. Is there something wrong with the instrument and should I return it, or is there a magic answer out there somewhere?

Hope you can help.

Roy