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Its still a good app Gibo, its just not detailed enough to give you all those small corrections that in the real world just get lost in the "noise" of wind and temperature variances.

For example
...

Wind from any direction has a vertical and horizontal effect, not just horizontal as you would think.

Projectile rpm in flight plus wind has an effect as well, but only minor as you have discovered

If you have your pressure set to absolute then your altitude needs to stay on zero.

Have you left the angle on anything other than 0

Or You set your sight in conditions to sea level ( approx 29.8 inhg) and now your settings are above sea level or you have a different barometric...