Airspeed and barber pole

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I have PC-12 with Bert & Autogyro mod installed. Everything is fine but I found strange behawior the Barber needle on airspeed indicator. The needle start going down from  320 knots and stay glued at red bar on indicator scale (236 knots) when plane is on 15000 ft altitude. In PC-12 manual (page 2-2) stay that Vmo=240 and Mmo=0.48, KIAS=236. Next page is Vmo schedule and we can find that for ex. At 30000 ft. KIAS is 173 knots so barber needle should be in this position. Am I right? How is in real aircraft? How shoul be?



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