Headwind DECREASES groundspeed but INCREASES the true airspeed, and that's the end of the story.

The range will be reduced with headwind, but the loss can be minimized by increasing the cruise speed...
A good rule of thumb: increase speed by 1 kt for every 20kt headwind, reduce speed by 1kt for every 20kt tailwind. 3-4kts is equal to 1/10 mach (at cruise altitude)
anyway, I'd like to see a screenshot of that if you're able to.

Btw check out my the link below my signature banner, it will give you a good idea how it works